ap calculus

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find the critical points, inflection points, the absolute minimum value of y, and the relative maximum points of y=x^4-3x^2+2

  • ap calculus -

    dy/dx = 4x^3 - 6x
    = 0 for max/mins

    2x(2x^2 - 3) = 0
    x = 0 or x = ±√(3/2)

    if x = 0, y = 2
    if x = +√(3/2) y = ....
    if x = -√(3/2) y = .... ----- you do the arithmetic

    y'' = 12x^2 - 6 = 0 for points of inflection
    x^2 = 6/12 = 1/2
    x = ±√(1/2)

    sub back in to get the two points of inflection

    I ran it through Wolfram to see the shape of the graph
    http://www.wolframalpha.com/input/?i=y%3Dx%5E4-3x%5E2%2B2

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