TeX Quellcode:

\begin{array}{rclll} f(-21) &=& \dfrac{2 \cdot (-21)^2-2 \cdot (-21)}{(-21)^3+2 \cdot (-21)^2-3 \cdot (-21)} &=& -\dfrac{1}{9} \quad \rightarrow \quad P_1\left(-21 \mid -\dfrac{1}{9}\right)\end{array}