TeX source:
\begin{array}{rclcl} 0 &=& x^2+2x-2 &\vert& \text{p-q-Formel} \cr x_{4,5} &=& -1\pm\sqrt{1^2+2} \cr\cr x_4 &=& -1+\sqrt{3} \approx 0{,}73 \cr\cr x_5 &=& -1-\sqrt{3} \approx -2{,}73 \cr\cr \mathbb{L} &=& \left\{-1-\sqrt{3}; 0; \dfrac{\sqrt{5}}{5}; -1+\sqrt{3}; 1\right\} \end{array}