TeX Quellcode:

\begin{array}{rcllll}f\left(-\sqrt{\dfrac{65}{8}}\right) &=& 2\sqrt[3]{\left(-\sqrt{\dfrac{65}{8}}\right)^2-8}-1 \\ \\&=& 2\sqrt[3]{\dfrac{1}{8}}-1 \\&=& 0\end{array}