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