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

$6 a b - 24 b = \left(6 b\right) \left(a - 4\right)$
$7 a - 28 = \left(7\right) \left(a - 4\right)$
$6 a b + 7 a - 24 b - 28$
$= \left(6 b + 7\right) \left(a - 4\right)$