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September 19, 2014

September 19, 2014

Posted by **Meteknesh** on Sunday, January 1, 2012 at 11:33pm.

- algebra -
**Steve**, Sunday, January 1, 2012 at 11:44pmjust use the old (a-b)(a+b) = a^2 - b^2

a^2 - 100 = (a+10)(a-10)

whew. At first I thought I'd read a^100 - 1. That would have had a few more factors!

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