Предмет: Алгебра, автор: Fluffy18

Решите квадратное уравнение: 36x²+20x-81=0

Ответы

Автор ответа: nastya240500

D=b^2-4ac
D= 400+36*81*4=400+11664=12064
x1= (-20+корень из 12064)/72
х2=(-20+корень из 12064)/72

Автор ответа: Fluffy18

А откуда 72?

Автор ответа: Fluffy18

Ай. Всё. Поняла

Автор ответа: kolibri082

Д= 400 + 36*4*81=11664=108(2)
х1=(-20+108)/36*2=11/9
х2=(-20-108)/36*2=-4/9

Автор ответа: Fluffy18

400 не прибавили

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