{"id":281371,"date":"2020-04-13T14:07:58","date_gmt":"2020-04-13T07:07:58","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=281371"},"modified":"2023-02-07T15:45:22","modified_gmt":"2023-02-07T08:45:22","slug":"persamaan-kuadrat-matematika-kelas-9","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/matematika\/persamaan-kuadrat-matematika-kelas-9\/","title":{"rendered":"Persamaan Kuadrat Rumus, Jenis dan Contoh Soal &#8211; Matematika Kelas 9"},"content":{"rendered":"<div id=\"attachment_281383\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-281383\" class=\"wp-image-281383 size-full\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1.png\" alt=\"Persamaan Kuadrat - Matematika Kelas 11\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1-263x175.png?crop=1 263w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-1-300x200.png 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-281383\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Meskipun di rumah saja, jangan sia-siakan waktumu dengan hal-hal yang kurang bermanfaat. Tetaplah belajar, belajar, dan belajar. Jika kamu butuh teman untuk belajar, Quipper Blog siap menemanimu.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Siapa yang hobi menonton sepak bola? Saat menonton sepak bola, tentu kamu pernah melihat sang pemain menendang bola dengan sudut tertentu sampai bola bisa membentuk lintasan parabola.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bagi seorang ilmuwan, lintasan bola yang berbentuk parabola tidak hanya sekadar lintasan biasa. Banyak besaran yang bisa ditentukan dari bentuk lintasan bola tersebut, contohnya sudut tendangan, kecepatan bola di titik tertinggi, dan lain-lain.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Besaran itu semua bisa ditentukan melalui suatu fungsi yang disebut fungsi kuadrat. Nah, persamaannya disebut persamaan kuadrat. Ingin tahu bagaimana bentuk persamaan kuadrat? <\/span><em><span style=\"font-weight: 400;\">Check this out<\/span><\/em><span style=\"font-weight: 400;\">!<\/span><\/p>\n<h2><strong>Pengertian Persamaan Kuadrat<\/strong><\/h2>\n<div id=\"attachment_281382\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-281382\" class=\"size-full wp-image-281382\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-2.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-2.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-2-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-2-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-281382\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Persamaan kuadrat adalah persamaan yang variabelnya memiliki pangkat tertinggi sama dengan dua (2). Adapun bentuk umum persamaan kuadrat adalah sebagai berikut.<\/span><\/p>\n<p><strong><em>ax<\/em><\/strong><sup><strong>2 <\/strong><\/sup><strong>+ <\/strong><strong><em>bx<\/em><\/strong><strong> + <\/strong><strong><em>c<\/em><\/strong><strong> = 0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">a, b <\/span><\/em><span style=\"font-weight: 400;\">&nbsp;= koefisien (<\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> \u2260 0);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = variabel; dan<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = konstanta.<\/span><\/p>\n<h2><strong>Jenis-Jenis Persamaan Kuadrat<\/strong><\/h2>\n<div id=\"attachment_281379\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-281379\" class=\"size-full wp-image-281379\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-5.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-5.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-5-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-5-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-281379\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Secara umum, persamaan kuadrat dibagi menjadi empat, yaitu sebagai berikut.<\/span><\/p>\n<h3><strong>1. Persamaan Kuadrat Biasa<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Persamaan kuadrat biasa adalah persamaan kuadrat yang nilai <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> = 1. Berikut ini contohnya.<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 3<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 2 = 0<\/span><\/p>\n<h3><strong>2. Persamaan Kuadrat Murni<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Persamaan kuadrat murni adalah persamaan kuadrat yang nilai <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = 0. Berikut ini contohnya.<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 2 = 0<\/span><\/p>\n<h3><strong>3. Persamaan Kuadrat Tak Lengkap<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Persamaan kuadrat tak lengkap adalah persamaan kuadrat yang nilai <\/span><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = 0. Berikut ini contohnya.<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 3<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = 0<\/span><\/p>\n<h3><strong>4. Persamaan Kuadrat Rasional<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Persamaan kuadrat rasional adalah persamaan kuadrat yang nilai koefisien dan konstantanya berupa bilangan rasional. Berikut ini contohnya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">4<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 3<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 2 = 0<\/span><\/p>\n<h2><strong>Cara Menentukan Akar Persamaan Kuadrat<\/strong><\/h2>\n<div id=\"attachment_281381\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-281381\" class=\"size-full wp-image-281381\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-3.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-3.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-3-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-3-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-281381\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Akar persamaan kuadrat merupakan salah satu faktor penting yang harus bisa kamu tentukan dalam penyelesaian persamaan kuadrat. Ada beberapa cara yang bisa kamu gunakan untuk mencari akar pada persamaan kuadrat, yaitu sebagai berikut.<\/span><\/p>\n<h3><strong>1. Faktorisasi<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Faktorisasi adalah penjumlahan suku aljabar menjadi bentuk perkalian faktornya. Jika kamu melakukan faktorisasi persamaan kuadrat, artinya kamu membuat perkalian dua buah persamaan linear.&nbsp;<\/span><\/p>\n<p><strong><em>ax<\/em><\/strong><sup><strong>2 <\/strong><\/sup><strong>+ <\/strong><strong><em>bx<\/em><\/strong><strong> + <\/strong><strong><em>c<\/em><\/strong><strong> = 0<\/strong><\/p>\n<p><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = hasil penjumlahan antara suku ke-1 dan ke-2<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = hasil perkalian antara suku ke-1 dan ke-2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Perhatikan contoh berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Bentuk persamaan kuadrat: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 5<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 6 = 0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Bentuk faktorisasi: (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 3) (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 2) = 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Akar: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -3 atau <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -2<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Bentuk persamaan kuadrat: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">&#8211; 9 = 0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Bentuk faktorisasi: (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 3)(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 3) = 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Akar: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = 3 atau <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -3<\/span><\/p>\n<h3><strong>2. Melengkapkan Kuadrat Sempurna<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Bentuk <\/span><strong><em>ax<\/em><\/strong><sup><strong>2 <\/strong><\/sup><strong>+ <\/strong><strong><em>bx<\/em><\/strong><strong> + <\/strong><strong><em>c<\/em><\/strong><strong> = 0 <\/strong><span style=\"font-weight: 400;\">bisa kamu jabarkan menjadi seperti berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + <\/span><em><span style=\"font-weight: 400;\">p<\/span><\/em><span style=\"font-weight: 400;\">)<\/span><sup><span style=\"font-weight: 400;\">2<\/span><\/sup><span style=\"font-weight: 400;\"> = <\/span><em><span style=\"font-weight: 400;\">q<\/span><\/em><\/p>\n<p><span style=\"font-weight: 400;\">Perhatikan contoh berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bentuk persamaan kuadrat: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 5<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 6 = 0<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 8<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 6 = 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 8<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">) = -6<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 8<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> +16 = -6 +16<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">+ 4)<\/span><sup><span style=\"font-weight: 400;\">2<\/span><\/sup> <span style=\"font-weight: 400;\">= 10<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">+ 4) = \u00b1 \u221a<\/span><span style=\"font-weight: 400;\">10<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = \u221a<\/span><span style=\"font-weight: 400;\">10<\/span><span style=\"font-weight: 400;\"> \u2013 4 atau <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = <\/span><span style=\"font-weight: 400;\">-\u221a<\/span><span style=\"font-weight: 400;\">10<\/span><span style=\"font-weight: 400;\"> \u2013 4<\/span><\/p>\n<h3><strong>3. Menggunakan Rumus abc<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun persamaan rumus abc adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281377\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-a.png\" alt=\"\" width=\"163\" height=\"77\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Perhatikan contoh berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tentukan akar persamaan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">&#8211; 4<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> &#8211; 5 = 0!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui: <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> = 1, <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = -4, dan <\/span><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = -5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Substitusikan nilai <\/span><em><span style=\"font-weight: 400;\">a, b, <\/span><\/em><span style=\"font-weight: 400;\">dan <\/span><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> ke persamaan abc.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281376\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-b.png\" alt=\"\" width=\"471\" height=\"218\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-b.png 471w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-b-300x139.png 300w\" sizes=\"(max-width: 471px) 100vw, 471px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, akar persamaan&nbsp; <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">&#8211; 4<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> &#8211; 5 = 0 adalah <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = 5 atau <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -1.<\/span><\/p>\n<h2><strong>Jenis-Jenis Akar Persamaan Kuadrat<\/strong><\/h2>\n<div id=\"attachment_281380\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-281380\" class=\"size-full wp-image-281380\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-4.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-4.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-4-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-4-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-281380\" class=\"wp-caption-text\">Foto: freepik.com<\/p><\/div>\n<p><span style=\"font-weight: 400;\">Sebelum membahas tentang jenis akar persamaan kuadrat, kamu akan dikenalkan terlebih dahulu dengan istilah diskriminan. Apa itu diskriminan? Diskriminan atau biasa dilambangkan <\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> adalah hubungan antarkoefisien yang menentukan besar dan jenis akar persamaan kuadrat. Pada pembahasan sebelumnya, kamu sudah mengenal rumus abc, yaitu sebagai berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281375\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-c.png\" alt=\"\" width=\"179\" height=\"71\"><\/p>\n<p><span style=\"font-weight: 400;\">Dari persamaan di atas, besaran yang dimaksud diskriminan adalah <\/span><strong><em>b<\/em><\/strong><sup><strong><em>2<\/em><\/strong><\/sup><strong> \u2013 4<\/strong><strong><em>ac<\/em><\/strong><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, persamaan rumus abc menjadi seperti berikut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281374\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-d.png\" alt=\"\" width=\"147\" height=\"85\"><\/p>\n<p><span style=\"font-weight: 400;\">Nah, jenis akar persamaan kuadrat ternyata bergantung pada nilai dari determinannya (<\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\">). Berikut ini penjelasannya.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Jika nilai <\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> &gt; 0, maka suatu persamaan kuadrat akan memiliki dua akar real yang tidak sama besar (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sub><em><span style=\"font-weight: 400;\">1<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> \u2260 <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sub><span style=\"font-weight: 400;\">2<\/span><\/sub><span style=\"font-weight: 400;\">).<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Jika nilai <\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> = 0, maka suatu persamaan kuadrat akan memiliki dua akar real dan kembar.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Jika nilai <\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> &lt; 0, maka suatu persamaan kuadrat tidak memiliki akar real (akarnya imajiner).<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Jika persamaan kuadrat ditulis dalam bentuk grafik, akan muncul grafik parabola seperti bentuk lintasan bola yang ditendang dengan kemiringan tertentu.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Agar pemahamanmu semakin <\/span><em><span style=\"font-weight: 400;\">cling-cling,<\/span><\/em><span style=\"font-weight: 400;\"> yuk simak contoh soal berikut.<\/span><\/p>\n<h2><strong>Contoh Soal 1<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Berapakah akar persamaan kuadrat dari <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 9<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 18 = 0?<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Ingat bahwa konstanta 18 bisa dibentuk oleh hasil perkalian antara 6 dan 3. Hal itu karena penjumlahan antara 6 dan 3 menghasilkan 9 (nilai <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\">). Dengan demikian, berlaku:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 9<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 18 = 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 6)(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 3) = 0<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -6 atau <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> = -3<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, akar persamaan kuadrat <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 9<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 18 = 0 adalah -6 atau -3.<\/span><\/p>\n<h2><strong>Contoh Soal 2<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Tentukan jenis akar persamaan kuadrat <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 16<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 64 = 0!<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Ingat, untuk menentukan jenis akar, kamu harus mencari nilai determinannya.<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">&#8211; 64 = 0<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> = 1<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = 16<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = 64<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> = (16)<\/span><sup><span style=\"font-weight: 400;\">2<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 4 . 1 . (-64)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&nbsp;&nbsp;&nbsp;&nbsp;= 256 \u2013 256<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&nbsp;&nbsp;&nbsp;&nbsp;= 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Oleh karena nilai <\/span><em><span style=\"font-weight: 400;\">D<\/span><\/em><span style=\"font-weight: 400;\"> = 0, maka persamaan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2 <\/span><\/sup><span style=\"font-weight: 400;\">+ 16<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 64 = 0 memiliki dua akar yang kembar (sama) dan real.<\/span><\/p>\n<h2><strong>Contoh Soal 3<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Tentukan akar persamaan 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 8<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 7 = 0 menggunakan rumus abc!<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui: <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\"> = 2, <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = -8, dan <\/span><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> = 7<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Substitusikan nilai <\/span><em><span style=\"font-weight: 400;\">a, b, <\/span><\/em><span style=\"font-weight: 400;\">dan <\/span><em><span style=\"font-weight: 400;\">c<\/span><\/em><span style=\"font-weight: 400;\"> ke persamaan abc.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-281373\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-e.png\" alt=\"\" width=\"437\" height=\"210\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-e.png 437w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/04\/Persamaan-Kuadrat-Matematika-Kelas-11-e-300x144.png 300w\" sizes=\"(max-width: 437px) 100vw, 437px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, akar persamaan 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><sup><span style=\"font-weight: 400;\">2<\/span><\/sup><span style=\"font-weight: 400;\"> \u2013 8<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> + 7 = 0 adalah 4,5 atau -1,5.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bagaimana Quipperian, mudah bukan? Semoga materi ini bisa bermanfaat buat kamu semua, ya. Tetap semangat belajar dan selalu jaga kesehatan serta kebersihan. Jika kamu bosan belajar sendirian, jadikan <\/span><a href=\"https:\/\/learn.quipper.com\/\"><span style=\"font-weight: 400;\">Quipper Video<\/span><\/a><span style=\"font-weight: 400;\"> sebagai mitra yang menyenangkan. Di sana, kamu akan diajar oleh para tutor andal lewat video, rangkuman, dan latihan soal. Salam Quipper!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">[spoiler title=SUMBER]<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"><a href=\"http:\/\/staff.uny.ac.id\/sites\/default\/files\/pendidikan\/Drs.%20Agus%20Santoso,%20M.Pd.\/Pers%20kuadrat.pdf\" rel=\"nofollow\">http:\/\/staff.uny.ac.id\/sites\/default\/files\/pendidikan\/Drs.%20Agus%20Santoso,%20M.Pd.\/Pers%20kuadrat.pdf<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/maths.id\/akar-akar-persamaan-kuadrat.php\" rel=\"nofollow\">https:\/\/maths.id\/akar-akar-persamaan-kuadrat.php<\/a><\/span><\/li>\n<li><span style=\"font-weight: 400;\"><a href=\"https:\/\/lektur.id\/arti-diskriminan\/%5B\/spoiler%5D\" rel=\"nofollow\">https:\/\/lektur.id\/arti-diskriminan\/%5B\/spoiler%5D<\/a><\/span><\/li>\n<\/ul>\n<p><strong>Penulis: Eka Viandari<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya! Meskipun di rumah saja, jangan sia-siakan waktumu dengan hal-hal yang kurang bermanfaat.&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":281383,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384888,679384865],"tags":[],"ppma_author":[679386827,679386836],"class_list":["post-281371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mapel","category-matematika"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Persamaan Kuadrat Rumus, Jenis dan Contoh Soal - Matematika Kelas 9 - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Quipperian, kamu sudah tahu belum pengertian dan jenis-jenis persamaan kuadrat? 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