Math

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Find any critical numbers of the function. (Enter your answers as a comma-separated list.)

g(x) = x^7 − 7x^5

Honestly, I have no idea how to find the critical number!

  • Math -

    by critical numbers, they mean
    the turning points, (maximim and minimum points)
    any points of inflection
    the x and the y -intercepts

    so for y-intercept, let x = 0
    so g(0) = 0, the origin (0,0) is both an x and a y intercept.
    for more x-intercepts , let y = 0
    x^7 - 7x^5 = 0
    x^5(x^2 - 7) = 0
    so x = 0 , x = ± √7

    g'(x) = 7x^6 - 35x^4 = 0 for max/mins
    7x^4(x^2 - 5) = 0
    x = 0 or x = ± √5

    g''(x) = 42x^5 - 140x^3
    = 0 for any points of inflection
    14x^3(3x^2 - 10) = 0
    x = 0 or x = ± √(10/3)

    since (0,0) is both a turning point and a point of inflection, It is neither a maximim nor a minimum

    so you have 4 other different x values to sub back into the original equation to find the corresponding y value of the points,
    I will leave that up to you

  • Math -

    Thank you I really appreciate your help :)

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