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Math Help - Need some basic differentiation help please

  1. #1
    Newbie
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    Need some basic differentiation help please

    I apologize if I'm posting in the wrong section.

    Question:

    Find the gradient of the curve y = 5/x^4 at the point where x = 2.

    Thanks in advance.
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  2. #2
    MHF Contributor Unknown008's Avatar
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    1. Find \dfrac{dy}{dx}

    2. Put x = 2 in \dfrac{dy}{dx}

    3. Simplify.

    That's it
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  3. #3
    Senior Member Sambit's Avatar
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    Oct 2010
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    y=5x^{-4}
    \frac{dy}{dx}=5(-4)x^{-4-1}<br />
                   = -20x^{-5}
    Now put x=2.
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