Okay I've got this:

$\displaystyle y-\sqrt{2}=(y+\sqrt{2})Ce^{-\sqrt{2}x^2}$

and need to make it so that

$\displaystyle y=\frac{\sqrt{2}(1+Ce^{-\sqrt{2}x^2})}{1-Ce^{-\sqrt{2}x^2}}$

Where C is just a constant

Need helps with then steps involved please...