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Math Help - write log as an expression

  1. #1
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    write log as an expression

    I get what the question asks for, i just dont get how to do it.

    Write an expression for the following, by using a sum/difference and/or a multiple:



    i think i got it, but im not sure:

    loga5a^4
    = loga5 + logaa^4
    = loga5 + 4logaa

    is there a way to reduce logaa?
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  2. #2
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    Quote Originally Posted by snypeshow View Post
    I get what the question asks for, i just dont get how to do it.

    Write an expression for the following, by using a sum/difference and/or a multiple:

    hints...

    \log(xy) = \log(x) + \log(y)

    and

    \log_b(b^n) = \textcolor{red}{n}
    Last edited by skeeter; November 8th 2009 at 05:29 PM. Reason: stoopid misteak
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  3. #3
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    yeah, i used both those identities. i edited my original post right after you posted
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  4. #4
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    Quote Originally Posted by snypeshow View Post
    I get what the question asks for, i just dont get how to do it.

    Write an expression for the following, by using a sum/difference and/or a multiple:



    i think i got it, but im not sure:

    loga5a^4
    = loga5 + logaa^4
    = loga5 + 4logaa

    is there a way to reduce logaa?
    remember the identity, that:
    logaa=1
    loga1=0
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