{"id":1000,"date":"2024-09-26T12:00:00","date_gmt":"2024-09-26T05:00:00","guid":{"rendered":"https:\/\/example.com\/?p=1000"},"modified":"2024-09-30T10:25:07","modified_gmt":"2024-09-30T03:25:07","slug":"matematika-kelas-10-membuat-fungsi-kuadrat-dari-grafik","status":"publish","type":"post","link":"https:\/\/staging-blog.sirogu.com\/blog\/matematika-kelas-10-membuat-fungsi-kuadrat-dari-grafik","title":{"rendered":"Cara Menyusun Persamaan dari Grafik Fungsi Kuadrat | Matematika Kelas 10"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong><img loading=\"lazy\" decoding=\"async\" style=\"height: auto; max-width: 100%; width: 820px; margin-left: auto; margin-right: auto; display: block;\" src=\"https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/hs\/Cara%20Merumuskan%20Fungsi%20Kuadrat%20Berdasarkan%20Grafik.jpg\" alt=\"Cara Merumuskan Fungsi Kuadrat Berdasarkan Grafik\" width=\"820\" height=\"410\" \/><\/strong><\/p>\n<blockquote>\n<p style=\"text-align: center;\"><em>Di kelas 9, kamu sudah belajar sedikit mengenai fungsi kuadrat. Nah di kelas 10 ini, kamu akan belajar bagaimana caranya merumuskan fungsi kuadrat berdasarkan grafik. Penasaran? Simak penjelasannya berikut ini, ya!<\/em><\/p>\n<p style=\"text-align: center; font-size: 16px;\"><em>&#8212;<\/em><\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Siapa di sini yang suka main <em>game<\/em> Angry Birds? <em>Game <\/em>yang sempat viral pada masanya itu, merupakan permainan di mana kita menembakkan burung menggunakan bantuan ketapel ke arah kastil musuh yaitu si babi hijau, supaya kastil mereka hancur.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media1.giphy.com\/media\/12OUZridgOdMOI\/giphy.gif\" \/><\/p>\n<p style=\"text-align: center; font-size: 16px;\"><em><span style=\"text-align: center; background-color: transparent;\">Angry Birds (Sumber: giphy.com)<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Kamu tahu nggak sih, pada <em>game<\/em> tersebut, burung yang kita lempar menggunakan ketapel akan membentuk lintasan parabola yang bentuknya seperti <strong>grafik fungsi kuadrat<\/strong>, lho!<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-size: 18pt;\">Ciri-Ciri Grafik Fungsi Kuadrat<\/span><\/h2>\n<p style=\"text-align: justify;\">Grafik fungsi kuadrat memiliki beberapa ciri, di antaranya yaitu:<\/p>\n<h3 style=\"text-align: justify; font-size: 16px; font-weight: normal;\">1.\u00a0Berbentuk <span style=\"font-weight: bold;\">parabola<\/span><\/h3>\n<h3 style=\"text-align: justify; font-size: 16px; font-weight: normal;\">2. Grafiknya\u00a0<span style=\"font-weight: bold;\">simetris<\/span><\/h3>\n<h3 style=\"text-align: justify; font-size: 16px; font-weight: normal;\">3. Hanya memiliki <span style=\"font-weight: bold;\">titik maksimum saja<\/span> atau <span style=\"font-weight: bold;\">titik minimum saja<\/span>, namun tidak keduanya<\/h3>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;\" src=\"https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/hs\/Ciri%20Ciri%20Grafik%20Fungsi%20Kuadrat.jpg\" alt=\"Ciri Ciri Grafik Fungsi Kuadrat\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Nah, dari grafik fungsi kuadrat, kita bisa merumuskan fungsi kuadratnya lho! Gimana ya, caranya?<\/p>\n<p style=\"text-align: justify;\">Eits, tapi sebelum masuk ke pembahasan itu, kita kilas balik sebentar yuk, ke materi fungsi kuadrat di kelas 9. Kamu masih ingat kan, tentang fungsi kuadrat? Kalau kamu lupa, coba cek videonya di <strong><a href=\"https:\/\/app.ruangguru.com\/\" target=\"_blank\" rel=\"noopener\">ruangbelajar<\/a><\/strong>, deh!<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-size: 18pt;\">Bentuk Umum Fungsi Kuadrat<\/span><\/h2>\n<p style=\"text-align: justify;\">Fungsi kuadrat merupakan <strong>aturan yang memasangkan semua anggota daerah asal tepat satu ke daerah kawan dengan pangkat pada variabel tertingginya adalah dua<\/strong>.<\/p>\n<p><strong>Baca Juga: <a href=\"\/blog\/menyusun-persamaan-kuadrat\" rel=\"noopener\">Cara Menyusun Persamaan Kuadrat<\/a><\/strong><\/p>\n<p style=\"text-align: justify;\">Bentuk umum dari fungsi kuadrat yaitu <span style=\"font-weight: bold;\">f(x) = ax<sup>2<\/sup> + bx + c<\/span>, dengan keterangan sebagai berikut:<\/p>\n<p style=\"text-align: justify; font-weight: bold;\">Keterangan:<\/p>\n<p style=\"text-align: justify;\">a = koefisien dari x<sup>2<\/sup>, di mana a \u2260 0<\/p>\n<p style=\"text-align: justify;\">b = koefisien dari x<\/p>\n<p style=\"text-align: justify;\">c = konstanta<\/p>\n<p style=\"text-align: justify;\">Nah, sekarang yuk, kita masuk ke pembahasan utama kita yaitu merumuskan fungsi kuadrat berdasarkan grafik!<\/p>\n<p style=\"text-align: center;\">&#8212;<\/p>\n<p style=\"text-align: justify;\">Sampai sini, sudah mulai paham belum dengan materi cara mencari persamaan pada grafik fungsi kuadrat? Kalo masih ada poin-poin yang belum kamu mengerti, mending belajar sama ahlinya, deh. Belajar bareng kakak-kakak pengajar di <a href=\"https:\/\/www.ruangguru.com\/privat\/matematika\"><strong>Ruangguru Privat Matematika<\/strong><\/a> misalnya.<\/p>\n<p style=\"text-align: justify;\">Belajar nggak cuma menyenangkan, tapi kamu juga bakal diajari konsepnya sampai paham! Para pengajar di Ruangguru Privat juga sudah terstandarisasi kualitasnya, loh. Kamu juga bisa pilih nih, mau diajarkan secara langsung (<em>offline<\/em>) atau daring (<em>online<\/em>). Fleksibel, kan? Untuk info lebih lanjut, cuss klik link berikut!<\/p>\n<p><a href=\"https:\/\/cta.ruangguru.com\/blog-rg10-privat\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn-web-2.ruangguru.com\/landing-pages\/assets\/94e6e69e-708c-48fc-b4e9-d277c9405371.png\" alt=\"CTA Ruangguru Privat\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-size: 18pt;\">Cara Merumuskan Fungsi Kuadrat Berdasarkan Grafik<\/span><\/h2>\n<p style=\"text-align: justify;\">Sebelum merumuskan fungsi kuadrat berdasarkan grafik, kita harus lihat dulu nih, nilai apa yang diketahui pada grafik tersebut, karena <strong>rumus yang akan kita pakai tergantung dari nilai apa yang diketahui pada grafik<\/strong>.<\/p>\n<p style=\"text-align: justify;\">Ada tiga macam rumus yang bisa kita pakai untuk merumuskan fungsi kuadrat berdasarkan grafik, yaitu:<\/p>\n<ol>\n<li style=\"text-align: justify; font-weight: normal; font-size: 16px;\">Jika pada grafik diketahui <span style=\"font-weight: bold;\">2 titik sembarang<\/span> pada <span style=\"font-weight: bold;\">sumbu x<\/span>, maka menggunakan rumus <span style=\"font-weight: bold;\">y = a(x &#8211; x<sub>1<\/sub>)(x &#8211; x<sub>2<\/sub>).<\/span><\/li>\n<li style=\"text-align: justify; font-weight: normal; font-size: 16px;\">Jika pada grafik diketahui <span style=\"font-weight: bold;\">titik puncak (x<sub>p<\/sub>, y<sub>p<\/sub>)<\/span> dan <span style=\"font-weight: bold;\">1 titik sembarang<\/span>, maka menggunakan rumus <span style=\"font-weight: bold;\">y = a(x &#8211; x<sub>p<\/sub>)<sup>2<\/sup> + y<sub>p.<\/sub><\/span><\/li>\n<li style=\"text-align: justify; font-weight: normal; font-size: 16px;\">Jika pada grafik diketahui <span style=\"font-weight: bold;\">3 titik sembarang<\/span>, maka menggunakan <span style=\"font-weight: bold;\">bentuk umum<\/span> fungsi kuadrat yaitu <span style=\"font-weight: bold;\">y = ax<sup>2<\/sup> + bx + c<\/span>, lalu gunakan <span style=\"font-weight: bold;\">eliminasi<\/span> untuk mencari nilai a, b, dan c.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Supaya kamu lebih paham, coba perhatikan infografik berikut, ya!<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;\" src=\"https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/hs\/Cara%20Merumuskan%20Fungsi%20Kuadrat%20Berdasarkan%20Nilai%20pada%20Grafik.jpg\" alt=\"Cara Merumuskan Fungsi Kuadrat Berdasarkan Nilai pada Grafik\" \/><\/p>\n<p><strong>Baca Juga: <a href=\"\/blog\/fungsi-komposisi\" rel=\"noopener\">Yuk, Belajar Fungsi Komposisi &amp; Contohnya, Lengkap!<\/a><\/strong><\/p>\n<p style=\"text-align: justify; font-weight: normal;\">Sekarang, kita lanjut mengerjakan latihan soal, yuk!<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-size: 18pt;\">Contoh Soal Grafik Fungsi Kuadrat<\/span><\/h2>\n<p style=\"text-align: justify;\">Sekarang, kita kerjakan contoh soal, yuk! Coba kamu perhatikan grafik berikut:<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"width: 480px; margin-left: auto; margin-right: auto; display: block;\" src=\"https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/hs\/Contoh%20Soal%20Grafik%20Fungsi%20Kuadrat.png\" alt=\"Contoh Soal Grafik Fungsi Kuadrat\" width=\"480\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Dari grafik tersebut, diketahui titik puncak atau titik balik dari suatu fungsi kuadrat, yaitu di titik (2, 1). Selain itu, diketahui juga 1 titik sembarang yaitu (1, 2). Coba rumuskan fungsi kuadratnya!<\/p>\n<p style=\"text-align: justify;\"><strong>Jawaban:<\/strong><\/p>\n<p style=\"text-align: justify;\">Diketahui dari soal bahwa:<\/p>\n<ul>\n<li aria-level=\"1\">(x<sub>p<\/sub>, y<sub>p<\/sub>) = (2, 1)<\/li>\n<li aria-level=\"1\">Titik sembarang = (1, 2)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Nah, sesuai penjelasan tadi, jika pada grafik diketahui titik puncak (x<sub>p<\/sub>, y<sub>p<\/sub>) dan 1 titik sembarang, maka kita menggunakan rumus:<\/p>\n<p style=\"text-align: justify;\">y = a(x &#8211; x<sub>p<\/sub>)<sup>2<\/sup> + y<sub>p<\/sub><\/p>\n<p style=\"text-align: justify;\">Yuk, kita coba uraikan!<\/p>\n<p style=\"text-align: justify;\">y = a(x &#8211; x<sub>p<\/sub>)<sup>2<\/sup> + y<sub>p<\/sub><\/p>\n<p style=\"text-align: justify;\">2 = a(1 &#8211; 2)<sup>2<\/sup> + 1<\/p>\n<p style=\"text-align: justify;\">2 = a(-1)<sup>2<\/sup> + 1<\/p>\n<p style=\"text-align: justify;\">2 = a(1) + 1<\/p>\n<p style=\"text-align: justify;\">2 = a + 1<\/p>\n<p style=\"text-align: justify;\">a = 2 &#8211; 1<\/p>\n<p style=\"text-align: justify;\">a = 1<\/p>\n<p style=\"text-align: justify;\">Karena titik puncaknya di (2, 1) dan nilai a = 1, maka fungsi kuadratnya:<\/p>\n<p style=\"text-align: justify;\">y = a(x &#8211; x<sub>p<\/sub>)<sup>2<\/sup> + y<sub>p<\/sub><\/p>\n<p style=\"text-align: justify;\">y = 1(x &#8211; 2)<sup>2<\/sup> + 1<\/p>\n<p style=\"text-align: justify;\">y = x<sup>2<\/sup> &#8211; 4x + 4 + 1<\/p>\n<p style=\"text-align: justify;\">y = x<sup>2<\/sup> &#8211; 4x + 5<\/p>\n<p style=\"text-align: justify;\">Selesai, deh! Jadi, dari grafik tersebut dapat kita rumuskan bahwa fungsi kuadratnya adalah f(x) = x<sup>2<\/sup> &#8211; 4x + 5.<\/p>\n<p style=\"text-align: center;\">&#8212;<\/p>\n<p style=\"text-align: justify;\">Gimana? Gampang, kan? Kalau kamu ingin tahu bagaimana cara merumuskan fungsi kuadrat berdasarkan grafik menggunakan kedua rumus lainnya, kamu bisa cek penjelasannya di video belajar beranimasi yang ada di <strong><a href=\"https:\/\/ruangguru.onelink.me\/blPk\/eaff0eb9\" target=\"_blank\" rel=\"noopener\">ruangbelajar<\/a><\/strong>, lho! Yuk, langganan sekarang!<\/p>\n<p style=\"text-align: justify;\"><strong><a class=\"rg-cta\" style=\"text-align: center;\" href=\"https:\/\/www.ruangguru.com\/download-for-desktop\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/cta\/f51e0d89-905d-477d-b7f8-546567f121d9.jpeg\" alt=\"IDN CTA Blog ruangbelajar for desktop Ruangguru\" width=\"800\" height=\"195\" \/><\/a><\/strong><\/p>\n<p style=\"text-align: left;\"><strong>Referensi:<\/strong><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: normal;\">Sinaga, B. dkk. (2017). <em>Matematika untuk SMA\/MA\/SMK\/MAK Kelas X Kurikulum 2013 Edisi Revisi 2017<\/em>. Jakarta: Pusat Kurikulum dan Perbukuan, Balitbang, Kemendikbud.<\/span><\/p>\n<p style=\"text-align: left;\"><strong>Sumber Gambar:<\/strong><\/p>\n<p style=\"text-align: left;\">GIF \u2018Angry Birds\u2019 [Daring]. Tautan: https:\/\/giphy.com\/gifs\/angry-birds-12OUZridgOdMOI (Diakses: 10 Agustus 2021)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di kelas 9, kamu sudah belajar sedikit mengenai fungsi kuadrat. Nah di kelas 10 ini, kamu akan belajar bagaimana caranya merumuskan fungsi kuadrat berdasarkan grafik. Penasaran? Simak penjelasannya berikut ini, ya! &#8212; &nbsp; Siapa di sini yang suka main game Angry Birds? Game yang sempat viral pada masanya itu, merupakan permainan di mana kita menembakkan [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":1000,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_knawatfibu_url":["https:\/\/cdn-web.ruangguru.com\/landing-pages\/assets\/hs\/Cara%20Merumuskan%20Fungsi%20Kuadrat%20Berdasarkan%20Grafik.jpg"],"_edit_last":["1"],"_edit_lock":["1727666567:1"],"_wp_old_date":["2022-11-17"],"_aioseo_title":["Cara Menyusun Persamaan dari Grafik Fungsi Kuadrat"],"_aioseo_description":["Di materi Matematika kelas 10 ini, kamu akan belajar cara merumuskan fungsi kuadrat berdasarkan grafik. Penasaran? Simak penjelasannya berikut ini, ya!"],"_aioseo_keywords":[""],"_aioseo_og_title":[null],"_aioseo_og_description":[null],"_aioseo_og_article_section":[""],"_aioseo_og_article_tags":[""],"_aioseo_twitter_title":[null],"_aioseo_twitter_description":[null]},"categories":[467,474],"tags":[52,10,256,37],"class_list":["post-1000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-matematika","category-matematika-sma-kelas-10","tag-kelas-10","tag-konsep-pelajaran","tag-matematika-x","tag-sma"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cara Menyusun Persamaan dari Grafik Fungsi Kuadrat | Matematika Kelas 10 - Belajar Gratis di Rumah Kapan Pun! | Blog Ruangguru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/staging-blog.sirogu.com\/blog\/matematika-kelas-10-membuat-fungsi-kuadrat-dari-grafik\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cara Menyusun Persamaan dari Grafik Fungsi Kuadrat | Matematika Kelas 10 - Belajar Gratis di Rumah Kapan Pun! | Blog Ruangguru\" \/>\n<meta property=\"og:description\" content=\"Di kelas 9, kamu sudah belajar sedikit mengenai fungsi kuadrat. 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