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Log rules

  1. Jun 11, 2009 #1
    1. The problem statement, all variables and given/known data

    If you have a.log(b)+ c.log(d), is that equal to,

    (a+c)log(bd) or (a.c)log(bd) ?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jun 11, 2009 #2


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    You know that [itex]a \log b=\log b^a[/itex] and you also know that [itex]\log a+\log b=\log ab[/itex]. Try to apply these to your expression, to find the correct results (both the results you listed are incorrect).
    Last edited: Jun 11, 2009
  4. Jun 11, 2009 #3
    So it would be log(b^a . d^c) ?
  5. Jun 11, 2009 #4


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    Hi Fairy111! :smile:

    (try using the X2 tag just above the Reply box :wink:)
    Yup! :biggrin:
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