TeX Quellcode:

\begin{array}{rclll}\dfrac{s^2+2}{s} &=& 0 &\vert& \cdot s \cr s^2+2 &=& 0 &\vert& -2 \cr s^2 &=& -2 &\vert& \pm\sqrt{} \cr\cr s_{1,2} &=& \pm\sqrt{-2} \end{array}