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Math Help - Need Logarithms help

  1. #1
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    Need Logarithms help

    Started online calculus. Tough learning alone.
    Anyone know how to solve x^-2.2=4127
    also 4e^(x-2)=1325
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Need Logarithms help

    1.) I would rewrite the equation as:

    x^{-\frac{11}{5}}=4127

    Raise both sides to a power of -\frac{5}{11}. What do you find?


    2.) Divide through by 4 to get:

    e^{x-2}=\frac{1325}{4}

    Convert from exponential to logarithmic form. What do you find?
    Thanks from pczort
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  3. #3
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    Re: Need Logarithms help

    1) 0.022725
    2) 7.8028
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  4. #4
    MHF Contributor MarkFL's Avatar
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    Re: Need Logarithms help

    My calculator shows the last digit of your result for 1.) to be a 6. However, unless you are asked to give a decimal approximation, I would give the exact result.
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