TeX Quellcode:

\begin{array}{rclcl}x^2-\dfrac{26}{5}x+\dfrac{169}{25} &=& 0 &\vert& \text{p-q-Formel} \\ x_{1,2} &=& \dfrac{13}{5}\pm\sqrt{\left(-\dfrac{13}{5}\right)^2-\dfrac{169}{25}} \\\\x_{1,2} &=& \dfrac{13}{5}\pm\sqrt{0} \\\\x_{1,2} &=& \dfrac{13}{5}\end{array}