The Arithmetic of Complex Numbers

$$\left({\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}{i}\right){\mathtt{\,\times\,}}\left({\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{i}\right) = {\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{i}{\mathtt{\,\small\textbf+\,}}{\mathtt{9}}{i}{\mathtt{\,\small\textbf+\,}}{\mathtt{6}}\left[{{i}}^{{\mathtt{2}}}\right] = {\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{11}}{i}{\mathtt{\,-\,}}{\mathtt{6}} = {\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{11}}{i}$$