2 x - 4*x + 3
x^2 - 4*x + 3
(x - 1)*(x - 3)
2 3 + x - 4*x
3 + x^2 - 4*x
3.0 + x^2 - 4.0*x
(-1 + x)*(-3 + x)
3 + x*(-4 + x)