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Math Help - find absolute minimum and maximum

  1. #1
    Member
    Joined
    Jan 2006
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    118

    find absolute minimum and maximum

    X^4-72X^2+1 ON INTERVAL [-5, 13].....FIND ABSOLUTE MINIMUM and absolute maximum


    I know i need the f'

    but i am struggling

    any help would be appreciated!!
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  2. #2
    Senior Member
    Joined
    Apr 2009
    From
    Atlanta, GA
    Posts
    408
    f'(x)=4x^3-144x

    Does this help?

    *Remember, (x^n)'=nx^{n-1}
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