TeX Quellcode:

\begin{array}{rclcl}x^2-\dfrac{7}{2}x+4 &=& 0 &\vert& \text{p-q-Formel}\\ x_{1,2} & = & \dfrac{7}{4} \pm\sqrt{\dfrac{49}{16}-4} \\ & = & \dfrac{7}{4} \pm\sqrt{-\dfrac{15}{16}}\end{array}