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