The factors of each term in the expression 8 x plus 12 x y are shown. 8 x : 1 , 2 , 4 , 8 , x 12 x y : 1 , 2 , 3 , 4 , 6 , 12 , x , y What is the greatest common factor of 8 x and 12 x y ?

The greatest common factor of the numbers 8 and 12 is 4. Both terms also contain x, while y appears only in 12xy. Therefore, the greatest common factor is 4x, which is choice A.

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