TeX Quellcode:

\begin{array}{rclcl} 0 &=& \sqrt{100-x^2} &\vert& ()^2 \cr 0 &=& 100-x^2 &\vert& +x^2 \cr x^2 &=& 100 &\vert& \pm\sqrt{} \cr x_{1,2} &=& \pm \sqrt{100} \cr\cr x_1 &=& 10\;\in\;\mathbb{D} \cr x_2 &=& -10\;\in\;\mathbb{D} \end{array}