2 x - 6*x + 5
x^2 - 6*x + 5
(x - 1)*(x - 5)
2 5 + x - 6*x
5 + x^2 - 6*x
5.0 + x^2 - 6.0*x
(-1 + x)*(-5 + x)
5 + x*(-6 + x)