TeX Quellcode:

\begin{array}{rclcl} -x^2-4x-68 &=& 0 &\vert& \cdot (-1) \cr x^2+4x+68 &=& 0 &\vert& \text{p-q-Formel} \cr x_{2,3}&=&-2\pm \sqrt{2^2-68} \cr &=& -2\pm \sqrt{-64} \cr &=& -2\pm \sqrt{-1\cdot 64} \cr &=& -2 \pm 8 \cdot \sqrt{-1} &\vert& \sqrt{-1}= i \cr \cr x_2 &=&-2+8i \cr x_3 &=&-2-8i \cr \cr \mathbb{L} &=& \left\{ i \; ; \; -2+8i \; ; \; -2-8i \right\} \end{array}