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Math Help - Concavity Problem?

  1. #1
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    Concavity Problem?

    Given 8x^(1/3)+x^(4/3), for what values is the graph of f concave downwards? and for what x values does the graph of f have points of inflection?

    I got 0<x<1 but the answer is supposed to be 0<x<4 and I'm not quite sure why.
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  2. #2
    MHF Contributor Calculus26's Avatar
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