TeX Quellcode:

\begin{array}{rcl} \left|\lambda\begin{pmatrix}-40\cr-20\cr70\end{pmatrix}\right| &=& \sqrt{{\left(-40\lambda\right)}^2+{\left(-20\lambda\right)}^2 +{\left(70\lambda\right)}^2} \cr &=& \sqrt{\lambda^2 \left(1.600+400+4.900\right)} \cr &=& \left|\lambda\right|\sqrt{6.900} \end{array}