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mathcalculus

HELP: use your knowledge of the derivative to compute the limit given below: lim (x+h)^(-3.25) -x^(-3.25)/h h->0 the derivative that is being calculated is dy/dx

  • 8 months ago
  • 8 months ago

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  1. BangkokGarrett
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    That is just a complicated way of asking you: "What is the derivative of x^-3.25 ?"

    • 8 months ago
  2. mathcalculus
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    oh.. but how do i get to my answer? what are the steps and why is it questioned in this format?

    • 8 months ago
  3. mathcalculus
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    i know how to find the derivative ^

    • 8 months ago
  4. mathcalculus
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    -3.25x^-4.25

    • 8 months ago
  5. mathcalculus
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    do we use quotient rule?

    • 8 months ago
  6. BangkokGarrett
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    If you are allowed to "use your knowledge of the derivative", you could say that by definition the derivative of a function (here your function is x^-3.25) is the limit as h approaches 0 of f(x + h) - f(x). Therefore, this limit equals the derivative of x^-3.25 which is (and you know how to do the derivative, right?)

    • 8 months ago
  7. BangkokGarrett
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    yes your derivative is correct

    • 8 months ago
  8. BangkokGarrett
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    no quotient rule here

    • 8 months ago
  9. mathcalculus
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    so whats the main purpose of these kinds of questions? for ex: what if it was a square root problem... do we find only the deriative of the f(x+h) an thats our answer?

    • 8 months ago
  10. BangkokGarrett
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    find the derivative of f(x)...forget about the h. I think your prof just want's you to see how easy it is to do limits in that form now that you can do derivatives. Or maybe he / she wants to reinforce how derivatives relate to limits.

    • 8 months ago
  11. mathcalculus
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    ex: (x+h)^(12/12) -x^(12/12) / h

    • 8 months ago
  12. mathcalculus
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    so do we find the derivative: 12?

    • 8 months ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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