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