TeX Quellcode:

\begin{array}{rclcl} -3x^2-100x+300 &=& -15x^2+20x &\vert & 15x^2-20x \cr 12x^2-120x+300 &=& 0 & \vert & :12 \cr x^2-10x+25 &=& 0 &\vert& \text{p-q-Formel} \cr x_{1,2} &=& \dfrac{10}{2} \pm \sqrt{\left(-\dfrac{10}{2}\right)^2-25} \cr x_{1,2} &=& 5 \pm \sqrt{0} \cr \cr x_1 &=& 5 \end{array}