x ------------ 2 x - 2*x + 5
x/(x^2 - 2*x + 5)
x ------------ 2 5 + x - 2*x
x/(5 + x^2 - 2*x)
x/(5.0 + x^2 - 2.0*x)
x -------------- 5 + x*(-2 + x)
x/(5 + x*(-2 + x))