2 3*x + 2*x - 1
3*x^2 + 2*x - 1
2 -1 + 2*x + 3*x
-1 + 2*x + 3*x^2
(x + 1)*(x - 1/3)
(1 + x)*(-1 + 3*x)
-1 + x*(2 + 3*x)
-1.0 + 2.0*x + 3.0*x^2