Question

(l+m)2 + (l-m)2 solve it

Answer 1

Answer:

Step-by-step explanation:

Using the identity: a² - b² = (a+b)(a-b)

(l+m)² - (l-m)²

= [(l+m)+(l-m)]×[(l+m)-(l-m)]

= [l+m+l-m]×[l+m-l+m]

= [2l]×[2m]

=4lm