[tex] \left[\begin{array}{ccc}3&1&1\\0&3&1\\0&0&3\end{array}\right] * \left[\begin{array}{ccc}3&1&1\\0&3&1\\0&0&3\end{array}\right] [/tex]
3*3+1*0+1*0=9
3*1+3*1+1*0=6
3*1+1*1+1*3=7
0*3+3*0+1*0= 0
0*1+3*3+1*0=9
0*1+3*1+1*3=6
0*3+0*3+3*0=0
0*1+0*3+3*0=0
0*1+0*1+3*3=9
[tex] \left[\begin{array}{ccc}9&6&7\\0&9&6\\0&0&9\end{array}\right] [/tex]
