TeX Quellcode:

\begin{array}{rcl} \left|\begin{pmatrix}-4\cr\cr\frac{x}{2}\cr\cr\frac{3x}{2}\end{pmatrix}\right| &=& \sqrt{{\left(-4\right)}^2+{\left(\dfrac{x}{2}\right)}^2 +{\left(\dfrac{3x}{2}\right)}^2} \cr &=& \sqrt{\dfrac{5}{2}x^2+16} \end{array}