Question

9lm-3n)^2- (9lm + 3n)^2 = -108 lmn.​

Answer 1

Here RHS = - 108lmn

LHS = ( 9lm - 3n ) ^2 - ( 9lm + 3n ) ^2

[ using a ^2- b^2 = ( a + b ) ( a - b ) ]

( 9lm - 3n + 9lm + 3n ) ( 9lm - 3n - 9lm - 3n )

( 18lm )( -6n ) = - 108 lmn

Hence verified

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Answer 2

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