2 x + 4*x + 4
x^2 + 4*x + 4
x + 2
2 4 + x + 4*x
4 + x^2 + 4*x
2 (2 + x)
(2 + x)^2
4 + x*(4 + x)
4.0 + x^2 + 4.0*x