Question

hiiii mates❤
please help!!!​

Answer 1

Step-by-step explanation:

Given ,

(l+m)²-(l-m)²

= [(l+m)+(l-m)][(l+m)-(l-m))]

/* By algebraic identity:

a²-b² = (a+b)(a-b)*/

=(l+m+l-m)(l+m-l+m)

=2l × 2m

= 4lm

Therefore,

(l+m)²-(l-m)² = 4lm

•••♪