Hi, for this problem I would normally use the Integration factor, but as it's $\displaystyle y^2$ I'm not too sure what to do.

$\displaystyle x\frac{dy}{dx} - y^2 = 4$

Have divided through by x, as I would normally in a question like this:

$\displaystyle \frac{dy}{dx} - \frac{y^2}{x} = \frac{4}{x}$.

Not too sure where to go from here however...

Thanks in advance for the help :)