Question
Factorise:
$21x^2 + 5x - 6$

Answer

$21x^2 + 5x - 6$
$= 21x^2 + 14x - 9x - 6$
$= 7x(3x + 2) - 3(3x + 2)$
$= (3x + 2)(7x - 3)$

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