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    tinabooe's Avatar
    tinabooe Posts: 2, Reputation: 1
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    #1

    Sep 24, 2009, 07:11 PM
    need local max/min
    f(x)=0.2x^4+0.3x^3-0.8x^2+5
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 25, 2009, 11:56 AM

    1. Find the derivative of f(x). (differentiate it, or find d(f(x))/dx)
    2. At maximum and minimum points, the derivative has a value of zero. So, set the derivative to zero, and solve for the values of x. You should have 3 answers.

    **You'll have to use
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