TeX source:
\begin{array}{rclcl} 0 &=& x^2-4x-32 &\vert& \text{p-q-Formel} \cr x_{1,2} &=& 2\pm\sqrt{(-2)^2+32} \cr x_{1,2} &=& 2\pm\sqrt{36} \cr\cr x_1 &=& 2+6=8 \cr x_2 &=& 2-6=-4 \cr\cr \mathbb{L} &=& \{-4;4;8\} \end{array}