Question

Решите уравнение

Answer 1

$x^{3} + 3x^{2}- 25 x^{} -75=0\\\\x^2(x+3)-25(x+3)=0\\\\(x^2-25)(x+3)=0\\\\(x+5)(x-5)(x+3)=0\\\\x_{1,2}=\pm5;\quad x_3=-3$