Which number makes this equation true

v^2 + 10v + 16 = (v + 8)(v + ?)

2

To find the second number, we can expand the right side of the equation:
(v + 8)(v + 2) = v^2 + 2v + 8v + 16 = v^2 + 10v + 16

Therefore, the missing number is 2.