Answer:
8 (3 + 8x)
Explanation:
Factor down the two values. The two multiples for 24 can be 8 and 3. The two multiple for 64 can 8 and 8. Overall, both the values are multiples of 8.
You put 8 out of the bracket since it's the GCF. 24 goes 3 times and 64 goes 8 times.
= 8 (3 + 8x)