/ 2 \ (x - 1)*\x - 5*x + 6/
/ 2 \ (-1 + x)*\6 + x - 5*x/
(-1.0 + x)*(6.0 + x^2 - 5.0*x)
(-1 + x)*(6 + x*(-5 + x))
(-1 + x)*(-3 + x)*(-2 + x)
3 2 -6 + x - 6*x + 11*x