2 - x - x - 2
-x^2 - x - 2
2 -2 - x - x
-2 - x - x^2
/ ___\ / ___\ | 1 I*\/ 7 | | 1 I*\/ 7 | |x + - + -------|*|x + - - -------| \ 2 2 / \ 2 2 /
(x + 1/2 + i*sqrt(7)/2)*(x + 1/2 - i*sqrt(7)/2)
-2.0 - x - x^2
-2 + x*(-1 - x)