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\begin{array}{rclcl rclcl}\text{1. Fall} & & & & & \text{2. Fall} \cr116 &=& x^2 +4x-1 &\vert& -116 \quad & 116 &=& -x^2+4x-1 &\vert& -116\cr 0 &=& x^2 +4x-117 &\vert& \text{p-q-Formel} & 0 &=& -x^2+4x-117 & \vert& \cdot (-1) \cr & & & & & 0 &=& x^2-4x+117 &\vert& \text{p-q-Formel} \cr x_{2,3} &=& -2\pm\sqrt{4+117} & & & x_{4,5} &=& 2\pm\sqrt{4-117}\cr x_{2,3} &=& -2\pm\sqrt{221} & & & x_{4,5} &=& 2\pm\sqrt{-113} \cr x_{2,3} &=& -2\pm 11 \cr\cr x_2 &=& 9 \cr x_3 &=& -13\end{array}