Factor ab-8a-bx+8x

$a b - 8 a - b x + 8 x$

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

$(a b - 8 a) - b x + 8 x$

Factor out the greatest common factor (GCF) from each group.

$a (b - 8) - x (b - 8)$

Factor the polynomial by factoring out the greatest common factor, $b - 8$ .

$(b - 8) (a - x)$