Question:
Factorize each of the following expression:
18a2x2 − 32
Solution:
$18 a^{2} x^{2}-32$
$=2\left(9 a^{2} x^{2}-16\right)$
$=2\left[(3 a x)^{2}-4^{2}\right]$
$=2(3 a x-4)(3 a x+4)$
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