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Homework Help: Concavity of this function

  1. Jun 30, 2011 #1
    What is the concavity of this function?

    X+x2/3? I got the second derivative, and I. Did not gvet a value. Does this function not have concavity?

    Note:2/3 is an exponent.
  2. jcsd
  3. Jun 30, 2011 #2
    Hi realism877! :smile:

    Note the x2 and x2 buttons in the edit screen. They allow you to write subscripts/supscripts.

    Anyway, you calculated the second derivative and you "don't get a value". What do you mean with that?? What is the second derivative of the function?

    Do you mean that you don't find a point where the second derivative is 0? Well, that's certainly true.
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