2 x + 3*x + 2
x^2 + 3*x + 2
2 2 + x + 3*x
2 + x^2 + 3*x
(x + 2)*(x + 1)
(1 + x)*(2 + x)
2 + x*(3 + x)
2.0 + x^2 + 3.0*x