The factors of 3a are 3 and a.
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It is: 3a(1-4b)
The greatest common factor (GCF) of 2a and 3a is a.
(3a + b)(3a - b)
Since 3a is a factor of 6ab, it is automatically the GCF.
There is a formula for the "difference of squares." In this case, the answer is (3A + B)(3A - B)