Question

factorise (l+m)^2 - (l-m)^2​

Answer 1

Answer:

4lm

Step-by-step explanation:

(l + m)^2 -  (l - m)^2  

=l^2 + 2lm + m^2 - (l^2  - 2lm + m^2)

=l^2 + 2lm + m^2  - l^2  + 2lm - m^2

l^2 -l^2 + m^2  - m^2   + 2lm + 2lm

4lm

hope this is helpful