Factorise:
$(l + m)^{2} - (l - m)^{2}$

4 l m

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4 m

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4 l

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4

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Solution

The correct option is A $4 l m$
$(l + m)^{2} - (l - m)^{2}$
$= [l^{2} + m^{2} + 2 l m - (l^{2} + m^{2} + 2 l m)]$
$= [l^{2} + m^{2} + 2 l m - l^{2} - m^{2} + 2 l m]$
$= 4 l m$

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