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Consider the curve defined by y4= y2- x2. At what ordered pair (x,y) is the line 4x√3-4y=1 tangent to the curve y4= y2- x2?

  • Maths -

    y^4 = y^2 - x^2

    The line 4√3 x - 4y = 1 has slope √3

    So, we want y'=√3

    4y^3 y' = 2yy' - 2x
    y' = -2x/(4y^3 - 2y)
    y' = x/(y - 2y^3)

    x/(y - 2y^3) = √3
    x = √3(y - 2y^3)
    √(y^2 - y^4) = √3(y-2y^3)
    y^2 - y^4 = 3(y^2 - 4y^4 + 4y^6)
    12y^6 - 11y^4 + 2y^2 = 0

    y^2 = 2/3 or 1/4
    x^2 = 2/9 or 3/64

    If you graph it, you will see that at the points

    (.47,.50) and (-.22,.81) the tangent is parallel to the given line.

  • Maths -

    x + 4y > -5, 4x + y < 2

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