(m-n)²=(m²-2m*n + n²)
(y+4)²=(y²+8y+16)
(3m+7n)²=(9m²+42n*m+49n²)
(5-a)(5+a)=5²—a²
(4a-b) (4a+b)=4a²-b²
4n²-9=(2n-3)(2n+3)
16k²-9d²=(4k-3d)(4k+3d)
(m-n)²=(m²-2m*n + n²)
(y+4)²=(y²+8y+16)
(3m+7n)²=(9m²+42n*m+49n²)
(5-a)(5+a)=5²—a²
(4a-b) (4a+b)=4a²-b²
4n²-9=(2n-3)(2n+3)
16k²-9d²=(4k-3d)(4k+3d)