TeX Quellcode:

\begin{array}{rclcl}u^2-\dfrac{2}{9}u-\dfrac{2}{27} &=& 0 &\vert& \text{p-q-Formel}\\\\u_{1,2} &=& \dfrac{1}{9}\pm\sqrt{\left(-\dfrac{1}{9}\right)^2+\dfrac{2}{27}}\\\\u_{1,2} &=& \dfrac{1}{9}\pm\sqrt{\dfrac{7}{81}}\\\\u_{1,2} &=& \dfrac{1}{9}\pm\dfrac{\sqrt{7}}{9}\\\\u_1 &=& \dfrac{1+\sqrt{7}}{9} \approx 0{,}41 \\\\u_2 &=& \dfrac{1-\sqrt{7}}{9} \approx -0{,}18\end{array}