GCF means greatest common factor. From the word itself, you find the largest common factor for all the terms of the function in order to factor it out. As a result, this simplifies the equation.
For the whole numbers, GCF = 9
For variable a, GCF = a3
For variable b, GCF = b2
Thus, the overall GCF is 9a3b2. The answer is B.
