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Math Help - Derivative of a Function

  1. #1
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    Derivative of a Function

    I'm having trouble with the derivative of a function... :

    4
    ____

    square root(1-x)
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  2. #2
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    Hello,
    Quote Originally Posted by cjh824 View Post
    I'm having trouble with the derivative of a function... :

    4
    ____

    square root(1-x)
    \frac{4}{\sqrt{1-x}}=4 \cdot (1-x)^{-1/2}
    Now just apply the chain rule, by using this derivative :
    (x^n)'=nx^{n-1}
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  3. #3
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    Well we have to do it by using the definition of derivative. I got an answer of

    2
    ___
    (1-x)^3/2

    but I don't think it's right.
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  4. #4
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    Quote Originally Posted by cjh824 View Post
    Well we have to do it by using the definition of derivative. I got an answer of

    2
    ___
    (1-x)^3/2

    but I don't think it's right.
    Why do you think it's not right ? Because it's exactly the derivative !
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