(x^2+2х)(х^2+2х-2)=3
x^4+4x^3+2x^2-4x-3=0
(x-1)*(x+1)^2*(x+3)=0
x-1=0
x=1
(x+1)^2=0
x+1=0
x=-1
x+3=0
x=-3
(x^2+2х)(х^2+2х-2)=3
x^4+4x^3+2x^2-4x-3=0
(x-1)*(x+1)^2*(x+3)=0
x-1=0
x=1
(x+1)^2=0
x+1=0
x=-1
x+3=0
x=-3