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Math Help - Maxima, minima, increase, and decrease

  1. #1
    Junior Member alane1994's Avatar
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    Question Maxima, minima, increase, and decrease

    Use the derivative f'(x)=(x-1)(x+2)(x+4) to determine the local maxima and minima of f, as well as the intervals of increase and decrease. It also asks for a sketch of f... I think that I can handle that.
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Maxima, minima, increase, and decrease

    From the given derivative, we see we have the 3 critical numbers: x=-4,-2,1 so we have 4 intervals. Since the roots are all of odd multiplicity, we know the sign of the derivative will alternate across intervals (so we really only need to test one interval). Then, use the first derivative test to determine the nature of the extrema. Can you proceed?
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  3. #3
    Junior Member alane1994's Avatar
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    Re: Maxima, minima, increase, and decrease

    I believe so, we just went over the first derivative test today in class so it isn't really all that founded in me yet.
    Also, thank you!
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  4. #4
    MHF Contributor MarkFL's Avatar
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    Re: Maxima, minima, increase, and decrease

    What are your conclusions about the function represented by the given derivative?
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