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Question
The product of ( l + m ) and ( l - m ) can be written as ______ .
The product of ( l + m ) and ( l - m ) can be written as ______ .
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Solution
The correct option is C l2 - m2
The product is given as:
( l+m ) ( l - m )
=l ( l - m ) + m ( l - m )
=l2 -lm +lm - m2
=l2 - m2
l2 - m2
The product is given as:
( l+m ) ( l - m )
=l ( l - m ) + m ( l - m )
=l2 -lm +lm - m2
=l2 - m2
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