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Math Help - exponential equations

  1. #1
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    exponential equations

    log(3x+5)= 3




    13^(-x/9) = 17

    i need help finding the solutions the negative threw me off.
    Last edited by pj Cala; April 21st 2008 at 01:54 PM. Reason: its fixed as of now
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  2. #2
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  3. #3
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by pj Cala View Post
    log(3x+5)= 3




    13^(-x/9) = 17

    i need help finding the solutions the negative threw me off.
    log(3x+5)=3\Rightarrow{3x+5=10^3}\Rightarrow{x=\fr  ac{10^3-5}{3}}

    13^{\frac{-x}{9}}=17...then by using our logarithim rules

    \frac{-x}{9}=log_{3}(17)\Rightarrow{x=-9log_{13}(17)}
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