It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question since 252 - 9 is simply 616!
The GCF is xy
Factor out the GCF and get X(X2-X+1).
The GCF is 4x.
The GCF is 4.
The GCF is 5.
The GCF is 3y^2.
The GCF is 2x.
5x squared
35ab squared
The GCF of 30 x^2 and 45x is 15x. The GCF of 30 and 45 is 15, and the GCF of x squared and x is x.
The GCF is 4xy
The GCF is 8.