Question

first expression = kl+lm+mn
second expression = 3k
product = ?​

Answer 1

(kl+lm+mn) (3k)

=kl(3k) + lm(3k) + mn(3k)

= 3k^2 + 3klm + 3kmn

= 3k( k+lm+mn)

I hope my answer helps you☺☺