2 x + 2*x - 1
x^2 + 2*x - 1
2 -1 + x + 2*x
-1 + x^2 + 2*x
/ ___\ / ___\ \x + 1 - \/ 2 /*\x + 1 + \/ 2 /
(x + 1 - sqrt(2))*(x + 1 + sqrt(2))
-1.0 + x^2 + 2.0*x
-1 + x*(2 + x)