Question

(c-4) (c+4) и (6k-9d)(6k+9d)

Answer 1

$(c-4)(c+4)=c^2-16 (6k-9d)(6k+9d) = 36k^2-81d^2$

Answer 2

(c-4)(c+4)=c²-16
(6k-9d)(6k+9d)=36k²-81d²