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Mathematics 15 Online
OpenStudy (anonymous):

log base 5 of (log base 3 of x)=0 how would i solve that

zepdrix (zepdrix):

\[\huge \log_5 (\log_3 x)=0\]Hmm that's a weird problem :) lol

zepdrix (zepdrix):

We can exponentiate both sides, writing them with a base of 5, because that is our outer log. That will give us,\[\huge 5^{\log_5 (\log_3 x)}=5^0\] The Exponential and Logarithm are INVERSE operations of one another, so they will essentially "cancel out". So the 5 and LOG will cancel out ok? Giving us,\[\huge (\log_3 x)=5^0\]Simplifying the right side gives us,\[\huge \log_3 x=1\]

zepdrix (zepdrix):

We'll have to do something similar for the inner log, but we don't want to exponentiate with a 5, since this inner log has a base of 3. Can you guess the next step? :o

OpenStudy (anonymous):

change it to inverse form and solve for x

OpenStudy (anonymous):

thank you so much

zepdrix (zepdrix):

Able to finish the rest on your own? :D

OpenStudy (anonymous):

yes. thx

OpenStudy (anonymous):

could you help me with another question

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