(x^2-2x-1)^2+3x^2-6x-13=0
Х^4-4x2-1+3x2-6x-13=0 x^4-x^2-6x-14=0 x^2(x^2-1)=0 -6x-14=0 X^2=0 -6x=14 X^2-1=0 6x=-14 X^2=1 x=-6/14 x=+-1