Select a suitable identity and find the following products

(kl – mn) (kl + mn)

Given:( kl – mn) (kl + mn),it is a product of 2 binomial expressions which have the terms :( kl – mn) and (kl + mn).

Now when we compare these expressions with the identities, we

find it in the form of (a-b)(a + b),where a = kl and b = mn,

The identity (a-b)(a + b) = a²-b²,

Hence, (kl – mn) (kl + mn) = (kl)²-(mn)²