(4a2-y)(y+4a2) помогите пж

(4a2-y)(y+4a2) = (4a2-y)(4a2+y) = 16a4-y2

(4a*2-y) * (y+4a*2) = (8a-y)*(y+8a) = (8a-y) * (8a+y) = 64a² - y²