Factorise: 16 a^2-225 b^2 - Vidyadip

Question

Factorise:
$16 a^2-225 b^2$

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Answer

Using: $a^2-b^2$
$=(a+b)(a-b)$
$=16 a 2-225 b^2$
$=(4 a)^2-(15 b)^2$
$=(4 a+15 b)(4 b-15 b)$

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