TeX Quellcode:

\begin{array}{rclcl}f(2) &=& -2^2+2\cdot 2+1 &=& 1 \cr f(1) &=& -1^2+2\cdot 1+1 &=& 2 \cr f(0) &=& -0^2+2\cdot 0+1 &=& 1 \end{array}