Well, isn't that just a happy little question! The greatest common factor of 8x and 28 is 4. You see, we can break down 8x into 4 * 2 * x and 28 into 4 * 7, and the highest factor they have in common is 4. Just remember, there are no mistakes, just happy little accidents in math!
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The GCF is 8x.
The GCF is 2.
The GCF is 2x.
8x
The GCF is 8x.