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Math Help - Logarithms - a long one...

  1. #1
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    Apr 2010
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    Logarithms - a long one...

    I got confused , how can i solve this? :
    1-\frac{4\log_{100}(20-x)}{\log(x)}=\frac{1}{\log_\frac{1}{10}(x)}



    Thanks...
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  2. #2
    Senior Member
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    Nov 2009
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    Thanks
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    Remember:
    \log_a(x) = \frac{\log_{10}(x)}{\log_{10}(a)}
    and
    1=\log_{10}(10)
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  3. #3
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    Yes I remembered it and just solved it, thank you.
    x=10
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