Ma'auni quadratic equation shine lissafin lissafi wanda za'a iya rubuta shi ta hanyar ax² bx c = 0, inda x shine mabambantan da ba'a sani ba kuma a, b, da c su ne akai-akai. A cikin wannan ma'auni, kalmar ax² kalma ce ta quadratic, bx lokaci ne na layi, kuma c shine tsayin daka. Ma'auni huɗun yawanci yana da mafita guda biyu ko tushen x, waɗanda za'a iya samun su ta amfani da dabarar quadratic:x = (-b ± sqrt(b² - 4ac)) / 2a inda sqrt ke nuna aikin tushen murabba'in. Ana amfani da ma'auni guda huɗu a algebra, ƙididdiga, da kimiyyar lissafi don ƙirƙira nau'ikan abubuwan mamaki, kamar motsin injina, halayen maɓuɓɓugan ruwa da sauran tsarin injina, da girma da ruɓewar al'umma.