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Calculus :)

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A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y=6–x^2. What are the dimensions of such a rectangle with the greatest possible area?

Find Width=____ & Height=4

just need to find width.. is not 2

  • Calculus :) - ,

    let the point of contact be (x,y)
    then the base is 2x and the height is y

    area = 2xy = 2x(6-x^2) = 12x - 2x^3
    d(area)/dx = 12 - 6x^2
    = 0 for a max of area
    6x^2 = 12
    x^2 = 2
    x = √2, then y = 6-2 = 4

    rectangle has a base of 2√2 and a height of 4

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