Предмет: Алгебра, автор: petruchik14ira

Розкладіть тричлен на множники -2x²+5x+7

Ответы

Автор ответа: calciicarbonas1

ответы получились следующими:
-1; -3,5

Приложения:

Автор ответа: GASio

это неверный ответ

Автор ответа: GASio

подставь свои значения в уравнение

Автор ответа: calciicarbonas1

Ок, подставил. -7+7=0 ; -25,5+ 17,5 = 7 следовательно 7-7=0. Всё верно.

Автор ответа: GASio

D=25-(4*(-2)*7)=81
(-b+D^(1/2))/(2*a)=(-5+9)/(-4)=-1
(-b-D^(1/2))/(2*a)=(-5-9)/(-4)=3,50;
(x-3,5)*(x+1)=0

Приложения:

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