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