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Which of the following expressions has a factor of

x + 8 a

, where

a

is a positive integer constant?

2 x^{2} + 20 x + 16 a

2 x^{2} + 30 x + 16 a

2 x^{2} + 40 x + 16 a

2 x^{2} + 50 x + 16 a