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Mathematics 51 Online
OpenStudy (anonymous):

Simplify

OpenStudy (anonymous):

|dw:1341995906264:dw|

OpenStudy (anonymous):

\[\huge \frac{1}{81} - \frac{1}{x^2}\]factor this using a^2-b^2 = (a+b)(a-b)

OpenStudy (anonymous):

use \[a ^{2} - b ^{2} = (a-b)\times (a+b)\]

OpenStudy (anonymous):

I dont get your jist

OpenStudy (anonymous):

\[\Large \frac{1}{Z}*\frac{1}{Z} = \frac{1}{Z^{2}}\] \[81 = Z^{2}\]

OpenStudy (anonymous):

|dw:1341996655362:dw|

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