Предмет: Алгебра, автор: Anonim4ik178

При каких значениях а уравнение х2 +(а+3)х +1=0 не имеет корней?
Напишите пожалуйста с решением.

Ответы

Автор ответа: Evgenia4836

3

Ответ:

Объяснение:

при D<0

D= (a+3)²-4*1*1= a²+6a+9-4= a²+6a+5

a²+5a+a+5<0

a(a+5)+(a+5)<0

(a+1)(a+5)<0

a∈(-5;-1)

Anonim4ik178: Спасибо огромное!

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