Question

factor
$21y {}^{2} - 2y - 3 =$
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Answer 1

Solution:-

$= > {21y}^{2} - 2y - 3 \\ = > {21y}^{2} - 9y + 7y - 3 \\ = > 3y( 7y - 3) + 1(7y - 3) \\ = > (3y + 1)(7y - 3)$

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