Question

Factorise: (l+m)2 - (l-m)2

Answer 1

(l+m)^2 - (l-m)^2 Using x^2-y^2=(x+y)(x-y) =[l+m+l-m][l+m-(l-m)] =2l[l+m-l+m] =2l*2m =4lm

Answer 2

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

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

= 2l × 2m

= 4 lm
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I hope it will help you