Question

pls solve this (l+m)^2 -4lm​

Answer 1

(l+m)^2 -4lm = (l^2 + m^2 +2lm) - 4lm          { by using the identity of (a+b)^2 }

                    = l^2 + m^2 +2lm - 4lm  

                    = l^2 + m^2 -2lm

hope it helps........

Answer 2

( l + m ) ² - 4lm

l ² + 2lm + m² - 4lm

l² - 2lm + m²

thank you so much for your answer friend