$$[\begin{matrix}1&2\\ 3&5\end{matrix}]+[\begin{matrix}2&5\\ 7&9\end{matrix}].$$
$\left(\begin{matrix}3&7\\10&14\end{matrix}\right)$
$$\left(\begin{matrix}1&2\\3&5\end{matrix}\right)+\left(\begin{matrix}2&5\\7&9\end{matrix}\right)$$
$$\left(\begin{matrix}1+2&2+5\\3+7&5+9\end{matrix}\right)$$
$$\left(\begin{matrix}3&2+5\\3+7&5+9\end{matrix}\right)$$
$$\left(\begin{matrix}3&7\\3+7&5+9\end{matrix}\right)$$
$$\left(\begin{matrix}3&7\\10&5+9\end{matrix}\right)$$
$$\left(\begin{matrix}3&7\\10&14\end{matrix}\right)$$
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$-28$
