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Simplify
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|dw:1341995906264:dw|
\[\huge \frac{1}{81} - \frac{1}{x^2}\]factor this using a^2-b^2 = (a+b)(a-b)
use \[a ^{2} - b ^{2} = (a-b)\times (a+b)\]
I dont get your jist
\[\Large \frac{1}{Z}*\frac{1}{Z} = \frac{1}{Z^{2}}\] \[81 = Z^{2}\]
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|dw:1341996655362:dw|
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