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December 19, 2014

December 19, 2014

Posted by **ROCKY** on Sunday, July 24, 2011 at 10:14pm.

- algebra -
**Reiny**, Sunday, July 24, 2011 at 11:16pmall you need is a set of factors of the expression

how about

81y^2 - 16z^2 = (9y+4z)(9y-4z)

make one the length, the other the width.

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