TeX Quellcode:

\begin{array}{rclcl} \dfrac{3}{2}x^2+5x+15 &=& x^2-x-20 & \vert & -x^2+x+20 \cr \dfrac{1}{2}x^2+6x+35 &=& 0 & \vert & \cdot 2 \cr x^2+12x+70 &=& 0 &\vert& \text{p-q-Formel} \cr x_{1,2} &=& -\dfrac{12}{2} \pm \sqrt{\left(\dfrac{12}{2}\right)^2-70} \cr x_{1,2} &=& -6 \pm \sqrt{-34} \end{array}