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Math Help - Calculating Logs

  1. #1
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    Calculating Logs

    What's the easiest way to calculate Log(to the base 0.3) x 1.25 ?
    I mean, how would I actually input that into my calculator? Do I ave to rearrange the equation?
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by J4553 View Post
    What's the easiest way to calculate Log(to the base 0.3) x 1.25 ?
    I mean, how would I actually input that into my calculator? Do I ave to rearrange the equation?
    Use logarithm base conversion formula to change to base 10.

     \log_nx=\frac{\log_bx}{\log_bn}

    \log_{.3}(1.25)=\frac{\log 1.25}{\log .3}
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  3. #3
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    Ok so for that problem I got an answer of -1

    And for the problem Log(to the base 2) x 0.5 I got an answer of approx. -0.185

    Is this correct?
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  4. #4
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    Quote Originally Posted by J4553 View Post
    Ok so for that problem I got an answer of -1

    And for the problem Log(to the base 2) x 0.5 I got an answer of approx. -0.185

    Is this correct?
    I believe you got your answers just reversed.

    \frac{\log(.5)}{\log(2)}=-1

    \frac{\log(1.25)}{\log(.3)}=-.1853393619
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