(x+7)(x-7)=
(x+9)(x-9)=
(x+3)(x-3)=
(-4x+3y)(+4x+3y) =
(5x + 2}{5x – 2) =
(10+ 1)(10-1)=
(y-12) (y+12)=
(100+1)(100-1)=
(3m+2n)(3m-2n) =
(4xy-2x)(4xy + 2x)=
(5x + 8)(5x - 8) =
(4y-5x)(4y+5x) =​