TeX Quellcode:

\begin{array}{rcl} \left|\lambda\begin{pmatrix}-\sqrt{20}\cr 13 \cr 25 \end{pmatrix}\right| &=&\sqrt{\lambda^2 \left(-\sqrt{20}\right)^2+13^2+25^2} \cr &=& \sqrt{\lambda^2 \left(20+169+625\right)} \cr &=& \left|\lambda\right|\sqrt{814} \end{array}