3 2 x - x - 2*x
x^3 - x - 2*x^2
/ ___\ / ___\ x*\x + -1 + \/ 2 /*\x + -1 - \/ 2 /
(x*(x - 1 + sqrt(2)))*(x - 1 - sqrt(2))
/ 2 \ x*\-1 + x - 2*x/
x*(-1 + x^2 - 2*x)
x^3 - x - 2.0*x^2