TeX Quellcode:

\begin{array}{rcl} \left|\lambda\begin{pmatrix}7\cr-8\cr10\end{pmatrix}\right| &=& \sqrt{{\left(7\lambda\right)}^2+{\left(-8\lambda\right)}^2 +{\left(10\lambda\right)}^2} \cr &=& \sqrt{\lambda^2 \left(49+64+100\right)} \cr &=& \left|\lambda\right|\sqrt{213} \end{array}