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March 29, 2015

March 29, 2015

Posted by **Ashley A.** on Saturday, December 17, 2011 at 8:36pm.

- math -
**Damon**, Saturday, December 17, 2011 at 8:46pmLOL

a^2 - b^2 = (a-b)(a+b) identity, know it

so

4 - 81 u^2 = (2-9u)(2+9u)

so

4 - 81 u^2 is the multiple you are looking for

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