4 2 x - 13*x + 36 --------------- 2 x - x - 6
(36.0 + x^4 - 13.0*x^2)/(-6.0 + x^2 - x)
2 / 2\ 36 + x *\-13 + x / ------------------ -6 + x*(-1 + x)
2 -6 + x + x
(-2 + x)*(3 + x)