2 2*y*(y + 2) - (y + 2)
(2*y)*(y + 2) - (y + 2)^2 при y = -4
(2*y)*(y + 2) - (y + 2)^2
(2*(-4))*((-4) + 2) - ((-4) + 2)^2
(2*(-4))*(-4 + 2) - (-4 + 2)^2
12
-(2.0 + y)^2 + 2.0*y*(2.0 + y)
(-2 + y)*(2 + y)
2 -4 + y