- TeX source:
- \begin{array}{rclcl} z^2+z-15 &=& 0 &\vert& \text{p-q-Formel} \cr z_{1,2} &=& -\dfrac12\pm\sqrt{\left(\dfrac12\right)^2+15} \cr\cr z_{1,2} &=& -\dfrac12\pm\sqrt{\dfrac{61}{4}} \cr\cr z_1 &=& \dfrac{-1+\sqrt{61}}{2} \approx 3{,}41 \cr\cr z_2 &=& \dfrac{-1-\sqrt{61}}{2} \approx -4{,}41\end{array}