Factorize each of the following expression:125x2 − 45y2
$125 x^{2}-45 y^{2}$
$=5\left(25 x^{2}-9 y^{2}\right)$
$=5\left[(5 x)^{2}-(3 y)^{2}\right]$
$=5(5 x-3 y)(5 x+3 y)$
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