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December 22, 2014

December 22, 2014

Posted by **carol** on Sunday, May 1, 2011 at 9:45am.

16y2 – 25z2

- math -
**Damon**, Sunday, May 1, 2011 at 9:51amI think you mean

16 y^2 - 25 z^2

in general:

a^2-b^2 = (a-b)(a+b)

so

(4y-5z)(4y+5z)

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