I'm currently studying maths, and need help with the following question:

$\displaystyle x^4 + 4yx - 2y^5 = 3$

I'm new to implicit differentiation, and have followed the book closely on this one (using dy/dx notation, which I am also new to). I've been using matlab to verify my answers, but it hasn't matched with this one.

My answer $\displaystyle dy/dx = \frac{(4x^3 + 4y + 4x)}{-10y^4}$

Matlab answer = $\displaystyle 4x^3 + 4y$

Can someone please help me with this?