TeX джерело:

AB=\left(\begin{array}{rr}-2\cdot 4-1\cdot 6+0\cdot8&-2\cdot 5-1\cdot 7+0\cdot9\\1\cdot 4+2\cdot 6+3\cdot8&1\cdot 5+2\cdot 7+3\cdot 9 \end{array}\right)\,=\,\left(\begin{array}{rr}-14 &-17\\40&46 \end{array}\right)\,