TeX Quellcode:

\begin{array}{rclcl} 0 &=& z^2-\dfrac{4}{7}z-\dfrac{480}{7} &\vert& \text{p-q-Formel} \cr\cr z_{1,2} &=& \dfrac{2}{7} \pm \sqrt{\left(-\dfrac{2}{7}\right)^2+\dfrac{480}{7}} \cr\cr z_{1,2} &=& \dfrac{2}{7} \pm \sqrt{\dfrac{3.364}{49}} \cr\cr z_1 &=& \dfrac{2}{7} + \dfrac{58}{7} = \dfrac{60}{7} \cr\cr z_2 &=& \dfrac{2}{7} - \dfrac{58}{7} = -8 \end{array}