TeX source:
\begin{array}{rclcl rclcl}\text{1. Fall} & & & & & \text{2. Fall} \cr256 &=& 3t^2-23 &\vert& +23 \quad & 256 &=& -3t^2-23 &\vert& +23 \cr 279 &=& 3t^2 &\vert& : 3 & 279 &=& -3t^2 &\vert& : (-3)\cr 93 &=& t^2 &\vert& \pm\sqrt{} & -93 &=& t^2 & \vert& \pm\sqrt{}\cr & & & & & \pm\sqrt{-93} &=& t \cr\cr t_2 &=& \sqrt{93} \cr t_3 &=& -\sqrt{93}\end{array}