TeX Quellcode:

\begin{array}{rclcl} 0 &=& x^2-x-2 &\vert& \text{p-q-Formel} \cr x_{2,3} &=& \dfrac{1}{2}\pm \sqrt{\left(\dfrac{-1}{2}\right)^2+2} \cr x_{2,3} &=& \dfrac12\pm\sqrt{\dfrac94} \cr\cr x_2 &=& \dfrac12 +\dfrac32 = 2 \cr x_3 &=& \dfrac12 -\dfrac32 = -1 \cr\cr\mathbb{L} &=& \left\{a;-1;2\right\}\end{array}