Предмет: Алгебра, автор: arunakanatovna228

ПОМОГИТЕ пожалуйста
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Ответы

Автор ответа: adorabl
1

Ответ:

Объяснение:

Ответ:

Объяснение:

2х^2-7х-9=0

D=49-4*2*(-9)=49+72=121

\/D=11

х1=(7+11):4=18:4=4,5

х2=(7-11):4=-4:4=-1

тк нам надо найти при каких принимает положительное значение, то строим прямую и отмечаем точки. ищем то, что больше нуля.

получается (-беск;-1) (4,5;+беск)

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