The answer is:
4(2x - 1)
In-depth explanation:
We factor a binomial by looking for its GCF. In our case, the binomial is
, and the GCF is 4.
So now we divide both terms (both 8x and -4) by the GCF (4):

Simplify

The GCF goes outside the parentheses:

Hence, this is the answer.