1-(у-2)(у-2)(у-2) = 1 - (y - 2)^2(y - 2) = 1 - (y^2 - 4y + 4) * (y - 2) = 1 - (y^3 - 4y^2 + 4y - 2y^2 + 8y - 8) = 1 - y^3 + 4y^2 - 4y + 2y^2 - 8y + 8 = - y^3 + 6y^2 - 8y + 9