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