The GCF is 4.
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The GCF is 6a2b
The GCF is c squared.
When you are trying to find the GCF of two numbers and one of the numbers is a multiple of the other, the GCF will be the smaller of the two numbers. The GCF of 3 and 9 is 3.
You need at least two numbers to find a GCF. If that's 12 and 8, the GCF is 4.
The question cannot be answered because the powers of a and b, at the start of the expression are not specified.