Factorise the following expressions
$9 x^{2} y^{2} - 25$

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Solution

Consider the following question.
$9 x^{2} y^{2} - 25 = {(3 x y)}^{2} - {(5)}^{2}$
$= (3 x y - 5) (3 x y + 5)$

Hence, this is the required answer..

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