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Math Help - interval and concave downward question

  1. #1
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    Dec 2009
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    interval and concave downward question

    y = 8x^3 - 2x^4
    find intervals of the graph when it concaves downward.

    (negative infinity, 0) ( 2, positive infinity)
    am i correct?
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  2. #2
    Super Member
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    It's concave downwards if y''<0 and y''(x)=24(x^2-2x)=24x(x-2) so...yeah you're right.
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