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