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Exponentials & Logarithms

Review question

Can we find these log expressions in terms of $\log_9 x$?
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Ref: R7298

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Question

Given that \(u=\log_9 x\), find, in terms of \(u\):

\(x\),
\(\log_9(3x)\),
\(\log_x 81\).

(Answers may not contain the word \(\log\).)