Предмет: Алгебра, автор: compik22

При каких значениях b уравнение 3x²+bx+12=0 не имеет корней?

Ответы

Автор ответа: m11m

3х²+bx+12=0
D=b²-4*3*12=b²-144 < 0
b²-144<0
(b-12)(b+12)<0
+ - +
-------- -12---------- 12 ----------
\\\\\
-12 < b < 12

Автор ответа: compik22

Спасибо огромное))

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