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Math Help - Logs

  1. #1
    RAz
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    Question Logs

    I understand what a logarithm is, I just can't put it to practice. When a question says "Express the following in terms of log a, log b, log c', what exactly does that mean?

    Say for a question like log abc

    All I see is abc to the base of 10. How do I express that?
    ______

    Then what does "Simplify the following; write as a single log" mean?

    Say for log 60 - log 4

    I don't think I can go log (60-4), that doesn't seem right.

    Sorry for the big question, exams are coming up D:
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by RAz View Post
    I understand what a logarithm is, I just can't put it to practice. When a question says "Express the following in terms of log a, log b, log c', what exactly does that mean?

    Say for a question like log abc

    All I see is abc to the base of 10. How do I express that?
    Recall that \log(uv)=\log(u)+\log(v)

    Do you think you can attempt this now? (You will need to apply this property twice)

    Then what does "Simplify the following; write as a single log" mean?

    Say for log 60 - log 4

    I don't think I can go log (60-4), that doesn't seem right.

    Sorry for the big question, exams are coming up D:
    Recall that \log(a)-\log(b)=\log\left(\frac{a}{b}\right)

    Do you think that you can attempt this now?
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  3. #3
    RAz
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    Thankyou Chris, you're a lifesaver. Should I google "log terms/expressions/functions" for an entire list?

    edit: should I study this http://www.purplemath.com/modules/logrules.htm
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  4. #4
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    Or you can just take a look at here.
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