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81a^2-4b^2
81a^2 - 4b^2 = (9a - 2b) (9a + 2b)
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Asked 11/21/2009 10:11:19 AM
Updated 9/17/2014 5:23:42 PM
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81a^2 - 4b^2 = (9a - 2b) (9a + 2b)
Added 9/17/2014 5:23:42 PM
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