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Math Help - Logarithm #2

  1. #1
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    Post Logarithm #2

    Could someone please help me out :

    I read this in a book just now:

    3 log30 30/15 = 3 [1- log30 3 - log30 5]

    Can someone show how this is possible
    Last edited by mr fantastic; June 2nd 2010 at 06:25 AM. Reason: Edited title.
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  2. #2
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    Quote Originally Posted by Satyajith View Post
    Could someone please help me out :

    I read this in a book just now:

    3 log30 30/15 = 3 [1- log30 3 - log30 5]

    Can someone show how this is possible
    Just use the properties of log a few times .

    3log 30/15=3(log 30-log 15)

    then log 30=1 and log 15=log 5 + log 3

    i meant log to the base 30.
    Last edited by mr fantastic; June 2nd 2010 at 06:26 AM.
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