1) (y-8)^2 = y^2 -16y + 64
2) (5+a)(5-a) = 25 - a^2
3) (6k-8n)(3k+4n) = 18k^2 + 24nk - 24nk - 32n^2 = 18k^2 - 32n^2
1) (y-8)^2 = y^2 -16y + 64
2) (5+a)(5-a) = 25 - a^2
3) (6k-8n)(3k+4n) = 18k^2 + 24nk - 24nk - 32n^2 = 18k^2 - 32n^2