Factorise: 4 a^2-9 - Vidyadip

Question

Factorise:
$4 a^2-9$

✓

Answer

$4 a^2-9$
$=(2 a)^2-(3)^2$
$=(2 a+3)(2 a-3)\left\{\therefore a^2-b^2=(a+b)(a-b)\right\}$

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