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Thread: Derivative of ln(-x)

  1. #1
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    Question Derivative of ln(-x)

    Can someone please explain to me why the derivative of ln(-x) is 1/x?

    Thanks!
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  2. #2
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    Re: Derivative of ln(-x)

    Quote Originally Posted by otownsend View Post
    Can someone please explain to me why the derivative of ln(-x) is 1/x?

    Thanks!
    For $x<0$, $\frac d {dx} \ln(-x) = \frac 1 {-x} \frac d {dx} (-x) = \frac 1 {-x}(-1) = \frac 1 x$.
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