The GCF of 20 and 4 is 4.
That factors to 4(5x - 1)
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The GCF is 2.
Divide the GCF into each to get the other factors.
The GCF of 12x and 20x to the fourth power is 4x
4z2
It means absolutely nothing. The C in GCF stabds for COMMON and you need more than one numbers or expressions (including polynomials) before there can be anything in common.