Ile to jest: (-2y-7) do kwadratu jaki tu wzor skroconego mnozenia

[latex](a+b)^{2} = a^{2}+2ab + b^{2}\\(-2y-7)^{2}=(2y+7)^{2} = (2y)^{2}+2*2y*7 + 7^{2} = 4y^{2}+28y + 49[/latex]