Question
Factorise:
$9 x^2-3 x-20$
$9 x^2-3 x-20$
✓
Answer
$9 x^2-3 x-20$
$=9 x^2-15 x+12 x-20$
$=3 x(3 x-5)+4(3 x-5)$
$=(3 x-5)(3 x+4)$
$=9 x^2-15 x+12 x-20$
$=3 x(3 x-5)+4(3 x-5)$
$=(3 x-5)(3 x+4)$
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