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Math Help - Did I get the correct critical numbers?

  1. #1
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    Did I get the correct critical numbers?

    I need help finding critical numbers of this function: -8x^3+24x
    The first derivative is -24x^2+24

    I got -1 and 1 for my only critical numbers.
    Is this right?
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  2. #2
    MHF Contributor
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    yep
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