8) 8 b + 4 a b - 16 b

If you meant to simplify the expression,

-8b+4ab

if factor: 4b(a-2)

Step-by-step explanation:

To simplify an expression, combine the like terms.

8b+4ab-16b, 8b and -16b are like terms.

-8b+4ab, notice 4ab has an extra a before the b, so it is not a like term of -8b

To factor it out:

The expression -8b+4ab both includes b in it.

Thus,

b(-8+4a) -8 and 4 can be has GCF of 4

=4b(a-2).