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OpenStudy (anonymous):
What is the value of f(x)=9^x when x=-2? A. 1/81 B. 81 C.1/18 D.18
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OpenStudy (anonymous):
\[b^{-n}=\frac{1}{b^n}\]
OpenStudy (anonymous):
therefore \[9^{-2}=\frac{1}{9^2}\]
OpenStudy (anonymous):
ah. therefore 1/81
jhonyy9 (jhonyy9):
A is right
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