Question
If $A=\left|\begin{array}{l}1215 \\ 1117\end{array}\right|$ and $B=\left|\begin{array}{ll}2 & 7 \\ 4 & 9\end{array}\right|$, find $:A+B$
✓
Answer
$\begin{array}{l}A=\left|\begin{array}{ll}12 & 15 \\ 11 & 17\end{array}\right|_{2 \times 2}, B=\left|\begin{array}{ll}2 & 7 \\ 4 & 9\end{array}\right|_{2 \times 2} \end{array} $
$ A+B=\left|\begin{array}{ll}12+2 & 15+7 \\ 11+4 & 17+9\end{array}\right| $
$ =\left|\begin{array}{ll}14 & 22 \\ 15 & 26\end{array}\right|_{2 \times 2}$
$ A+B=\left|\begin{array}{ll}12+2 & 15+7 \\ 11+4 & 17+9\end{array}\right| $
$ =\left|\begin{array}{ll}14 & 22 \\ 15 & 26\end{array}\right|_{2 \times 2}$
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