Question
Factorise:
$12 x^2-27$
$12 x^2-27$
✓
Answer
$12 x^2-27$
$=3\left(4 x^2-9\right)$
$=3(2 x)^2-(3)^2$
$=3(2 x+3)(2 x-3)$
$=3\left(4 x^2-9\right)$
$=3(2 x)^2-(3)^2$
$=3(2 x+3)(2 x-3)$
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