How do you factor by grouping $6ab+7a-24b-28$ ?

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Answer 1 · 2015-04-13T13:32:32

By looking for common factors among pairs of terms we see
$6ab -24b = (6b)(a-4)$
and
$7a-28 = (7)(a-4)$

So
$6ab+7a-24b-28$

$= (6b+7)(a-4)$

How do you factor by grouping 6ab+7a-24b-286ab+7a-24b-28?