2 x + 5*x - 3
x^2 + 5*x - 3
2 -3 + x + 5*x
-3 + x^2 + 5*x
/ ____\ / ____\ | 5 \/ 37 | | 5 \/ 37 | |x + - - ------|*|x + - + ------| \ 2 2 / \ 2 2 /
(x + 5/2 - sqrt(37)/2)*(x + 5/2 + sqrt(37)/2)
-3 + x*(5 + x)
-3.0 + x^2 + 5.0*x