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OpenStudy (anonymous):
How would I factor out 9a^2 - 1?
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OpenStudy (amistre64):
you need to be able to recognize the form that this is in as: the difference of squares; i think its called... (3a + 1) (3a - 1) in essense, when we see a problem like this, we factor it as with like terms, but a different sign in the middle....
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