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)