Предмет: Алгебра, автор: prime544

найдите корни уравнения 1)x^2-x-56=0 2)-x^2+x+72=0 3)x^2+x-90=0 4)x^2+x-210=0

Ответы

Автор ответа: Jaaa18

1) Х = -7 ; Х = 8
2) Х = -8 ; Х = 9
3) Х = -10 ; Х = 9
4) Х = -15 ; Х = 14

Приложения:

prime544: можно с решением

Jaaa18: через дискриминант?

prime544: да

Jaaa18: окей

prime544: спасибо

Jaaa18: исправила ошибку во 2 (на фото)

prime544: Спасибо

Jaaa18: там делить на -2

prime544: хорошо

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