Question

(l + m)2 – (l-m)2 factorise
help me to clear this ​

Answer 1

Step-by-step explanation:

applying formulae a²-b²= (a+b) (a-b)

= {(l+m)+(l-m)} {(l+m)-(l-m)}

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

(+m) and (-m) will cut and similarly (+l) and(-l) will cut

= 2l ×2m

= taking 2 common , 2lm (Ans)