Equation 14.29.614762A8A84D0

\begin{align} z_ b& =\sqrt{q^2+2H_*^2},\qquad S_* =\sqrt{r^2+4p^2+2z_ b(1-r^2)^2},\\ x_ b& =(S_*-r)/2,\qquad y_ b=(S_*+r)/2.\tag{14.29.7} \end{align}