2 x + 2*x + 1
x^2 + 2*x + 1
x + 1
2 1 + x + 2*x
1 + x^2 + 2*x
1.0 + x^2 + 2.0*x
2 (1 + x)
(1 + x)^2
1 + x*(2 + x)