Question 1 - A-Level Maths

Exam Board	Edexcel
Module	C4 (Core Mathematics 4)
Topic	Implicit equations and differentiation

$$x ^ { 2 } + 2 x y ^ { 2 } + y = 4$$ Find an expression for $\frac { \mathrm { d } y } { \mathrm {~d} x }$ in terms of $x$ and $y$.