2 x + 2*x + 2
x^2 + 2*x + 2
(x + 1 + I)*(x + 1 - I)
(x + 1 + i)*(x + 1 - i)
2 2 + x + 2*x
2 + x^2 + 2*x
2.0 + x^2 + 2.0*x
2 + x*(2 + x)