[tex]\boxed{\begin{array}{l}\sf a_{11}=4\cdot1+3\cdot1=7\\\sf a_{12}=4\cdot1+3\cdot2=10\\\sf a_{13}=4\cdot1+3\cdot3=13\\\sf a_{21}=4\cdot2+3\cdot1=11\\\sf a_{22}=4\cdot2+3\cdot2=14\\\sf a_{23}=4\cdot2+3\cdot3=17\\\rm A=\begin{bmatrix}\sf7&\sf10&\sf13\\\sf11&\sf14&\sf17\end{bmatrix}\end{array}}[/tex]
