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 + x*(-2 - x)
1.0 - x^2 - 2.0*x