Question
Factorise:
$15 x^2-x-28$
$15 x^2-x-28$
✓
Answer
$15 x^2-x-28$
$=15 x^2+20 x-21 x-28$
$=5 x(3 x+4)-7(3 x+4)$
$=(3 x+4)(5 x-7)$
$=15 x^2+20 x-21 x-28$
$=5 x(3 x+4)-7(3 x+4)$
$=(3 x+4)(5 x-7)$
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