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