Ayat matematik yang mengandungi simbol ‘=’ dikenali sebagai kesamaan.
Satu kesamaan yang melibatkan ungkapan kuadratik ialah satu persamaan kuadratik.
Persamaan di atas melibatkan satu pembolehubah x dan kuasa tertinggi bagi x ialah 2.
Bentuk persamaan seperti ini dinamakan sebagai bentuk am.
Huruf selain x juga boleh digunakan untuk mewakili sesuatu pembolehubah.
Contoh
Tulis semula setiap persamaan kuadratik yang
berikut dalam bentuk am.
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