2 x - x - 1
x^2 - x - 1
/ ___\ / ___\ | 1 \/ 5 | | 1 \/ 5 | |x + - - + -----|*|x + - - - -----| \ 2 2 / \ 2 2 /
(x - 1/2 + sqrt(5)/2)*(x - 1/2 - sqrt(5)/2)
2 -1 + x - x
-1 + x^2 - x
-1.0 + x^2 - x
-1 + x*(-1 + x)