9.) 8 - 1, 2, 4, 8
16 - 1, 2, 4, 8, 16
Both’s GCF is 8.
8a + 16ac = 8(a + 2ac)
10.) a = -5
c = -1
9a + 16c
Substitute.
9(-5) + 16(-1) = -45 + (-16)
Answer: -61
11.) -4b - 8c + 12 - 8b + 2c + 6
Combine like terms.
-4b - 8b = -12b
-8c + 2c = -6c
12 + 6 = 18
New expression: -12b - 6c + 18