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December 20, 2014

December 20, 2014

Posted by **Fai** on Wednesday, May 2, 2012 at 2:23pm.

- Intermediate algebra -
**Steve**, Wednesday, May 2, 2012 at 3:09pma^2-b^2 = (a+b)(a-b)

first, factor out the 9 to get

9(x^4 - 9y^2)

9(x^2+3y)(x^2-3y)

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