2 x - x - 3
x^2 - x - 3
2 -3 + x - x
-3 + x^2 - x
/ ____\ / ____\ | 1 \/ 13 | | 1 \/ 13 | |x + - - + ------|*|x + - - - ------| \ 2 2 / \ 2 2 /
(x - 1/2 + sqrt(13)/2)*(x - 1/2 - sqrt(13)/2)
-3.0 + x^2 - x
-3 + x*(-1 + x)