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Given: x^2 + xy + y^2 - 7 = 0, solve for y using the quadratic forumula. Then find dy/dx at P(1,2) from a function of the form f(x).

My solution:

y = -x (+/-) sqrt( x^2 - 28) / 2.

I am not sure if this is correct. After solving for y, do you have to implicitly take the derivative of y?

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# Homework Help: Implicit Differentiation

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