2 x - 2*x + 1
x^2 - 2*x + 1
2 1 + x - 2*x
1 + x^2 - 2*x
x - 1
1 + x*(-2 + x)
2 (-1 + x)
(-1 + x)^2
1.0 + x^2 - 2.0*x