TeX Quellcode:

\begin{array}{rcl}z_1 \cdot z_2 &=& (3+5i)\cdot(-2+8i) \\ &=& 3\cdot(-2)+3\cdot 8i-5i\cdot 2+5\cdot 8i^2 \\ &=& -6+24i-10i-40 \\ &=& -46+14i\end{array}