Solve 3^x=15 by taking the natural logarithm of both sides.

Solve 3^x=15 by taking the natural logarithm of both sides.

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x log3 = log15
x = log15/log3

The natural logarithm is ln not log

\[3^x = 15\]
\[\ln 3^{3^x} =\ln 3^{15}\]
\[x=15\ln3\]

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