Question
Factorise:
$a^3+a-3 a^2-3$
$a^3+a-3 a^2-3$
✓
Answer
$a^3+a-3 a^2-3$
$=a\left(a^2+1\right)-3\left(a^2+1\right)$
$=(a-3)\left(a^2+1\right)$
$=a\left(a^2+1\right)-3\left(a^2+1\right)$
$=(a-3)\left(a^2+1\right)$
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