2 x + x - 4
x^2 + x - 4
/ ____\ / ____\ | 1 \/ 17 | | 1 \/ 17 | |x + - - ------|*|x + - + ------| \ 2 2 / \ 2 2 /
(x + 1/2 - sqrt(17)/2)*(x + 1/2 + sqrt(17)/2)
2 -4 + x + x
-4 + x + x^2
-4 + x*(1 + x)
-4.0 + x + x^2