TeX source:
\begin{array}{rclll} 9 &=& 10^{x^2-4}-1 &\vert & +1 \cr 10 &=& 10^{x^2-4} &\vert & \log_{10}()\cr 1 &=& x^2-4 &\vert & +4\cr 5 &=& x^2 &\vert & \pm\sqrt{ }\cr\cr x_2 &=& \sqrt{5} \in\mathbb{D} & & \rightarrow \quad P_2\left(\sqrt{5} \mid 9\right) \cr x_3 &=& -\sqrt{5} \in\mathbb{D} & & \rightarrow \quad P_3\left(-\sqrt{5} \mid 9\right)\end{array}