TeX Quellcode:

\begin{array}{rclcl} \large 0 &=& \dfrac{1}{2}x^2-\dfrac{2}{3}x+\dfrac{2}{9} &\vert & \cdot 2 \cr 0 &=& x^2-\dfrac{4}{3}x+\dfrac{4}{9} &\vert & \text{p-q-Formel} \cr x_{1,2} &=& -\left(-\dfrac{2}{3}\right) \pm \sqrt{\left(-\dfrac{2}{3}\right)^2-\dfrac{4}{9}} \cr\cr &=& \dfrac{2}{3} \pm \sqrt{\dfrac{4}{9}-\dfrac{4}{9}} \cr\cr &=& \dfrac{2}{3}-0 \cr\cr &=& \dfrac{2}{3} \end{array}