This is annoying but I can't figure out how to get x just as a function of v? How?!?!

$2x^2 - x^4 = \frac{v^2}{2}$

Thanks.

2. Originally Posted by Jason Bourne
This is annoying but I can't figure out how to get x just as a function of v? How?!?!

$2x^2 - x^4 = \frac{v^2}{2}$

Thanks.
Solve it as a quadratic in $x^2$, then take square roots

3. thanks its so obvious and i must be having a bad day