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