TeX Quellcode:

\begin{array}{rclcl rclcl} \text{1. Fall} & & & & & \text{2. Fall} \cr 0 &=& -2x^2-20x+78 &\vert& :(-2) & 0 &=& 2x^2+20x-78 &\vert& :2 \cr 0 &=& x^2+10x-39 &\vert& \text{p-q-Formel} & 0 &=& x^2+10x-39 &\vert& \text{p-q-Formel} \cr x_{2,3} &=& -5\pm\sqrt{(-5)^2+39} & & & x_{4,5} &=& -5\pm\sqrt{(-5)^2+39} \cr x_{2,3} &=& -5\pm\sqrt{64} & & & x_{4,5} &=& -5\pm\sqrt{64} \cr\cr x_2 &=& -5+8 = 3 & & & x_4 &=& -5+8 = 3 \cr x_3 &=& -5-8 = -13 & & & x_5 &=& -5-8 = -13 \end{array}