Math (Calculus) (Implicit Differentiation)

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The equation of the line tangent to (x^2+y^2)^4=16x^2y^2 at (x,y)=(−1,1) is ay = bx + c, where a, b and c are positive integers. What is the value of a+b+c?

  • Math (Calculus) (Implicit Differentiation) -

    (x^2+y^2)^4=16x^2y^2
    (x^2+y^2)^3 (x+yy') = 4xy^2 + 4x^2yy'
    x(x^2+y^2)^3 + y(x^2+y^2)^3 y' = 4xy^2 + 4x^2yy'
    (y(x^2+y^2)^3 - 4x^2y)y' = 4xy^2 - x(x^2+y^2)^3
    y' = (4xy^2 - x(x^2+y^2)^3)/(y(x^2+y^2)^3 - 4x^2y)

    at (1,-1) y' = (4-8)/(-8+4) = 1

    So, now you have a point and a slope, so

    y+1 = 1(x-1)
    ...

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