TeX Quellcode:

\begin{array}{rclcll} 0 &=& \sqrt[3]{x^2-9}+4 &\vert& -4 \\ -4 &=& \sqrt[3]{x^2-9} &\vert& ()^3 \\ -64 &=& x^2-9 &\vert& +9 \\ -55 &=& x^2 &\vert& \pm\sqrt{} \\ \pm\sqrt{-55} &=& x \\ \end{array}