Factorise: 9 a^2 b-25 - Vidyadip

Question

Factorise:
$9 a^2 b-25$

✓

Answer

Using: $a^2-b^2=(a+b)(a-b)$
$=(3 a b)^2-(5)^2$
$=(3 a b+5)(3 a b-5)$

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