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Math Help - Tangent question.

  1. #1
    Junior Member
    Joined
    Dec 2009
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    61

    Tangent question.

    Find the value of the constant c so that the tangent at the origin to the curve
    y = x(c-x^2)
    makes an angle of 45 degrees with the positive x axis

    Not really sure what it means with the angle (tan45=1)??
    I differentiated it and got c = 3x^2
    Is that right?
    Thanks
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  2. #2
    MHF Contributor Unknown008's Avatar
    Joined
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    Mauritius
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    1,260
    That it asks you, is that the curve should just touch the line y = x, which is at 45 degrees with the x axis.

    Can you try again with this in mind?
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