Question

(x^2-1)^3+2(x^2-1)^2=0

Answer 1

(x^2-1)^3+2(x^2-1)^2=0
x^2-1=t
t^3+2t^2=0
t^2(t+2)=0
t=0
x^2-1=0
x=1
x=-1
t=-2
x^2-1=-2
x^2=-1
не имеет корней

Answer 2

....................................
x=0 или x=-1