it is a combination of perfect squares
the square of 9x is squared is +/- 3x, and the square of 4 is +/- 2
so the answer is (3x+2)(3x-2)
which is 9xsquared-6x+6x-4
=9xsquared-4
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factor out a 3x 3x(x-3)=3x2-9x
If that's + 49y2, the answer is (9x - 7y)(9x - 7y) or (9x - 7y)2
If that's + 49y2, the answer is (9x - 7y)(9x - 7y) or (9x - 7y)2
If that's + 18x + 1, the answer is (9x + 1)(9x + 1) or (9x + 1)2
The GCF of 6x and 9x is 3x