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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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13y ago
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Q: How do you factor 9x squared-4?
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