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
-3.0 + x + x^2
-3 + x*(1 + x)