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Math Help - Derivative: x in denominator and in exponent

  1. #1
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    Derivative: x in denominator and in exponent

    Hey everyone,

    I'd like to find the extrema of a function (setting the 1st derivative to zero if my high school maths doesn't fail me here...).

    Anyhow, one term in this function is

    <br />
\frac{1}{2^x}<br />

    ...and I have no clue what the derivative of that is!

    Any help would be really appreciated!
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  2. #2
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    Johannesburg, South Africa
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    use  a^{x}=e^{xln(a)}
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  3. #3
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    Derivative of 1/ 2^x = - ln2/ 2^X
    When this derivative becomes zero?
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