Предмет: Алгебра, автор: kotikula98

ДАЮ 100 БАЛЛОВ! ЗА СПАМ КИДАЮ ЖАЛОБЫ!
Число -5 является корнем уравнения 3х²+9х+m=0. Найдите второй корень уравнения и значение m.

Ответы

Автор ответа: Universalka
1

3x^{2} +9x+m=0\\\\x^{2}+3x+\frac{m}{3}=0\\\\x_{1}=-5\\\\x_{1} +x_{2} =-3\\\\x_{2}=-3-x_{1}=-3-(-5)=-3+5=2\\\\\boxed{x_{2} =2}\\\\\frac{m}{3} =x_{1}*x_{2}=-5*2=-10\\\\\boxed{m=-30}

Universalka: Обновите страницу, я немного подправила .
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