Предмет: Алгебра, автор: nastasiapanda

Помогите пожалуйста,очень нужно!!!
Решите уравнение
 7а^3-28а=0

Ответы

Автор ответа: Helen040697
0
7a^3-28a=0
a(7a^2-28)=0
left { {{a=0} atop {7a ^{2}-28 =0}} right.
7a^2-28=0
7a^2=28
a^2=4
a=2
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