The GCF of 6x and 9x is 3x
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3x
The GCF is 9.
The GCF is 3.
The GCF is 3.
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