TeX Quellcode:

\begin{array}{rclll}3x^2-9x-12 &\neq & 0 & \vert & :3\\x^2-3x-4 &\neq & 0 &\vert &\textrm{p-q-Formel}\\x_{1,2} &\neq & \dfrac{3}{2}\pm\sqrt{\left(\dfrac{3}{2}\right)^2+4}\\\\x_{1,2} &\neq & \dfrac{3}{2}\pm\sqrt{\dfrac{25}{4}}\\\\x_1 &\neq & \dfrac{3}{2}+\dfrac{5}{2} = 4 \\x_2 &\neq & \dfrac{3}{2}-\dfrac{5}{2} = -1\end{array}