4 3 x - x - x - 1
x^4 - x^3 - x - 1
4 3 -1 + x - x - x
-1 + x^4 - x - x^3
/ ___\ / ___\ | 1 \/ 5 | | 1 \/ 5 | (x + I)*(x - I)*|x + - - + -----|*|x + - - - -----| \ 2 2 / \ 2 2 /
(((x + i)*(x - i))*(x - 1/2 + sqrt(5)/2))*(x - 1/2 - sqrt(5)/2)
-1.0 + x^4 - x - x^3
/ 2\ / 2 \ \1 + x /*\-1 + x - x/
(1 + x^2)*(-1 + x^2 - x)
/ 2 \ -1 + x*\-1 + x *(-1 + x)/
-1 + x*(-1 + x^2*(-1 + x))