2 x - 2*x + 4
x^2 - 2*x + 4
2 4 + x - 2*x
4 + x^2 - 2*x
/ ___\ / ___\ \x + -1 + I*\/ 3 /*\x + -1 - I*\/ 3 /
(x - 1 + i*sqrt(3))*(x - 1 - i*sqrt(3))
4.0 + x^2 - 2.0*x
4 + x*(-2 + x)