2 - x + 7*x - 10
-x^2 + 7*x - 10 при x = 1
-x^2 + 7*x - 10
-(1)^2 + 7*(1) - 10
-1^2 + 7 - 10
-4
-10.0 - x^2 + 7.0*x
-10 + x*(7 - x)
-(-5 + x)*(-2 + x)