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    Hoddi's Avatar
    Hoddi Posts: 5, Reputation: 1
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    #1

    Feb 18, 2010, 05:55 AM
    log(base x)8=3-log(base x)125
    I'm not to sure what to do when the base is = to x
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 18, 2010, 06:51 AM

    Just use the standard manipulations that are valid for logs. For example:



    You'll end up with a result like this:



    From this just apply the definition of the log:

    If
    , then
    .
    From that you'll be abet to determine the value of x.
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