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