TeX Quellcode:

\begin{array}{rclcl} z_1 = x^2 &=& \dfrac{15}{2} &\vert & \pm\sqrt{} \cr x_{1,2} &=& \pm\sqrt{\dfrac{15}{2}} \approx\pm 2{,}74\;\in\;\mathbb{D} \cr\cr z_2 = x^2 &=& -\dfrac{1}{2} &\vert & \pm\sqrt{} \cr x_{3,4} &=& \pm\sqrt{-\dfrac{1}{2}} \end{array}