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Math Help - Find the value of k, please help.

  1. #1
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    Find the value of k, please help.

    Fig 1 shows skectches of the curve
    y = 3x^2 + k

    The area of A is 3 times the area of B, Find the value of K.
    Please help.
    Attached Thumbnails Attached Thumbnails Find the value of k, please help.-area-b-k.bmp  
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  2. #2
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    I think it goes:

    Integrate 3x^2+k and you get: x^3 + kx

    Now we know A = 3B so using the integral above we get:

    A as 8 + 2k, and
    B as 1 + k

    so 8 + 2k = 3(1 + k)

    Which gives k = 5
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  3. #3
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    Thanks.
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