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How do you factor the expression $21x^2 - 22x - 8$ ?

1 Answer

Mar 5, 2016

$=(3x-4)(7x+2)$

Explanation:

$21x^2-22x-8$
$=21x^2-28x+6x-8$
$=7x(3x-4)+2(3x-4)$
$=(3x-4)(7x+2)$

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