Implicit differentiation ~ I keep getting this one wrong: http://www.tiikoni.com/tis/view/?id=edb260e

Question

shauna77777 · Answer

Help appreciated! :)

freckles · Answer

can i see what you have after differentiating both sides
do not solve for anything
i'm just asking for the step that happens from the differentiation

freckles · Answer

nevermind i think i see the problem

freckles · Answer

the negative you have there outside the fraction
I think you missed located it

freckles · Answer

I think you meant to put that negative right beside the 2x^4y term

unklerhaukus · Answer

check the sign

unklerhaukus · Answer

$$x^4y^2-x^4y+5xy^3=0$$taking the derivative with respect to $y$
$$2x^4y-x^4+15xy^2+\left(4x^3y^2-4x^3y+5y^3\right) \frac{dx}{dy}=0\
\frac{dx}{dy}=-\frac{2x^4y-x^4+15xy^2}{4x^3y^2-4x^3y+5y^3}$$

shauna77777 · Answer

Yes that was it! Thank you all!