Factorise by the grouping method : a^3+ a - 3a^2- 3 - Vidyadip

Question

Factorise by the grouping method : $a^3+ a - 3a^2- 3$

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Answer

$a^3+ a - 3a^2- 3$
$=a (a^2+ 1) -3(a^2+ 1)$
$=(a^2+ 1)(a -3).$

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