3 2 x + x - x - 1
x^3 + x^2 - x - 1
2 3 -1 + x + x - x
-1 + x^2 + x^3 - x
(x + 1)*(x - 1)
-1.0 + x^2 + x^3 - x
2 (1 + x) *(-1 + x)
(1 + x)^2*(-1 + x)
-1 + x*(-1 + x*(1 + x))