Factorise: 81-49 x^2 - Vidyadip

Question

Factorise:
$81-49 x^2$

✓

Answer

$81-49 x^2$
$=(9)^2-(7 x)^2$
$=(9+7 x)(9-7 x)\left\{\because a^2-b^2=(a+b)(a-b)\right\}$

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