2 2 x + x*x + x + x
x + x*x^2 + x + x^2
/ ___\ / ___\ | 1 I*\/ 7 | | 1 I*\/ 7 | x*|x + - + -------|*|x + - - -------| \ 2 2 / \ 2 2 /
(x*(x + 1/2 + i*sqrt(7)/2))*(x + 1/2 - i*sqrt(7)/2)
/ 2\ x*\2 + x + x /
x*(2 + x + x^2)
x^2 + x^3 + 2*x
2 3 x + x + 2*x