TeX Quellcode:

\begin{array}{rclcl}f(4) &=& \dfrac{1}{4} \cdot 4^2 - 1 &=& 3 \cr f(2) &=& \dfrac{1}{4} \cdot 2^2 - 1 &=& 0 \cr f(-5) &=& \dfrac{1}{4} \cdot (-5)^2 - 1 &=& 5{,}25 \end{array}