{{Babel|af|en|de-2|ja-2|la-2}}
I really don't have much to say here...
k = ey
k = -e^{ln(\frac{Ji}{1-Ji})-2ln(S)-xln(A)}
y^{2} = \frac{S^{2}(1-p)+\frac{kp}{A^{x}}-TS^{2}}{T}
y = \sqrt{\frac{S^{2}(1-p)+\frac{kp}{A^{x}}-TS^{2}}{T}}