The GCF is 14.
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Well, darling, the greatest common factor (GCF) of 14xy and 7x squared is 7x. Why? Because it's the largest number that can divide both terms without leaving a remainder. So, there you have it, 7x is the GCF, case closed.
The GCF is 4.
GCF(14, 28, 42) = 14.
GCF(14, 28, 21) = 7
The GCF is 4.