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Math Help - prove f(x) is constant

  1. #1
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    prove f(x) is constant

    Can someone explain to me where the (-1/x^2) comes from in step 2 and why?
    It is in the attached image.
    Thanks for any input.
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  2. #2
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    Quote Originally Posted by jlmills5 View Post
    Can someone explain to me where the (-1/x^2) comes from in step 2 and why? It is in the attached image.
    Using the chain rule the factor \frac {-1}{x^2} is the derivative of \frac {1}{x}.
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  3. #3
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    of course. thank you.
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