TeX Quellcode:

\begin{array}{rclcll} 105 &=& 7x^2-14x+49 & \vert & -105 \cr 0 &=& 7x^2-14x-56 & \vert & :7 \cr 0 &=& x^2-2x-8 &\vert& \text{p-q-Formel} \cr x_{1,2} &=& 1 \pm \sqrt{(-1)^2+8} \cr x_{1,2} &=& 1 \pm \sqrt{9} \cr\cr x_1 &=& 1+3 = 4 & \rightarrow \quad P_2(4 \mid 105) \cr x_2 &=& 1-3 = -2 & \rightarrow \quad P_3(-2 \mid 105) \end{array}