calculus

find dy/dx implicit differentiation
x^2y+y^2x=0
at x=-2, x=2

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  1. 2xydx+x^2 dy + 2yxdy+y^2 dx=0

    dy/dx(x^2+2yx)=-(y^2/2xy)

    ok, at the given point, you can figure dy/dx. I am not certain what you mean for the point to be.

  2. x^2(dy/dx) + 2xy + y^2 + 2xy(dy/dx) = 0
    (dy/dx)(x^2 + 2xy) = - y^2 - 2xy
    dy/dx = (-y^2-2xy)/(x^2 + 2xy)

    when x = -2 in original
    4y + 2y^2 = 0
    2y(2 + y)=0
    y = 0 or y = -2

    now plug in (-2,0) and (-2,-2) into dy/dx

    do the same using x = 2

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  3. Do you mean x = -2, y = 2?

    Do you mean x^2*y + y^2*x = 0 ?

    What are the exponents?
    2 or 2x and 2y?

    x cannot have two values unless you want the derivative at two different points.

    Anyway, implicit differentiation with respect to x results in:
    x^2*dy/dx + y*2x + y^2 + 2y = 0

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  4. I messed up in the calculation of the point
    when x = -2
    4y - 2y^2 = 0
    2y(2-y)=0
    y = 0 or y = 2

    So the second point is (-2,2) not (-2,-2)

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