(y+2)^2-4y^2=(y+2-2y)*(y+2+2y)=(2-y)*(2+3y). ответ: (2-y)*(2+3y). ^-это степень.
(y+2)²-(4y)² = (y+2-4y)×(y+2+4y) =
(2-3y)×(5y+2)
(y+2)²-(4y)² = (2-3y)×(5y+2)
