Factorise $(l + m)^{2} - 4 l m$

(2 l - m)^{2}

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(l + m)^{2}

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(l - m)^{2}

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(l - 2 m)^{2}

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Solution

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

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