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Math Help - Logarithm exponential, solve for x

  1. #1
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    Logarithm exponential, solve for x

    I don't know how to solve this.
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  2. #2
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    Quote Originally Posted by mwok View Post
    I don't know how to solve this.
    Take natural logarithms of both sides, noting that:

     ln(e^{f(x)}) = f(x)
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  3. #3
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    Take not lne = 1

    e^1-2x = 5
    lne^1-2x = ln 5 ( ln both sides )
    1-2x(lne) = ln5
    1-2x = ln5
    2x = 1-ln5
    x = 1-ln5/2
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