Question

Решите уравнение х3+х2-4х-4=0

Answer 1

$x^3+x^2-4x-4=0\ x^2(x+1)-4(x+1)=0\ (x+1)(x^2-4)=0\ (x+1)(x-2)(x+2)=0\ x+1=0\ x-2=0\ x+2=0\ x=-1\ x=2\ x=-2$