Question

Решите уравнение
x^3-2x^2-9x+18=0

Answer 1

х^2(x-2)-9(x-2)=0
(x-2)(x^2-9)=0
x-2=0 или x^2-9=0
х=2          х=+-3

Answer 2

$x^3-2x^2-9x+18=0\ \ x^2(x-2)-9(x-2)=0\ \ (x^2-9)(x-2)=0\ \ (x-3)(x+3)(x-2)=0\ \x-3=0;quad x+3=0;quad x-2=0\ x=3qquadquad x=-3qquadquad x=2$