Question
Factorise:
$3 x^3-48 x$
 

Answer

$3 x^3-48 x$
$=3 x\left(x^2-16\right)$
$=3 x\left[(x)^2-(4)^2\right]$
$=3 x(x+4)(x-4)\left[\therefore a^2-b^2=(a-b)(a+b)\right]$

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