2 x - 4*x + 5
x^2 - 4*x + 5
(x + -2 + I)*(x + -2 - I)
(x - 2 + i)*(x - 2 - i)
2 5 + x - 4*x
5 + x^2 - 4*x
5.0 + x^2 - 4.0*x
5 + x*(-4 + x)