2 -1 + x + 2*x*(x + 1)
-1 + x^2 + (2*x)*(x + 1) при x = 1
-1 + x^2 + (2*x)*(x + 1)
-1 + (1)^2 + (2*(1))*((1) + 1)
-1 + 1^2 + 2*(1 + 1)
4
2 -1 + x + 2*x*(1 + x)
-1.0 + x^2 + 2.0*x*(1.0 + x)
2 -1 + 2*x + 3*x
(1 + x)*(-1 + 3*x)