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Chain rule differentiation hwk help

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    Hi,

    There's one question that I know how to work out but I'm still struggling to understand how you differentiate 1/500r^2.

    I've also attached another question. I know that you need to use the chain rule to work it out but I'm not sure what it's asking.

    Thanks
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     \displaystyle \frac{1}{500r^2} = \frac{1}{500}r^{-2} .

    Use the rule  d/dx (x^n) =nx^{n-1} .
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    (Original post by B_9710)
     \displaystyle \frac{1}{500r^2} = \frac{1}{500}r^{-2} .

    Use the rule  d/dx (x^n) =nx^{n-1} .
    So does it become (-2)×1/500r^-3?
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    (Original post by VioletPhillippo)
    So does it become (-2)×1/500r^-3?
    Yes.
 
 
 
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