5. Addition on 3×3 matrices

Determine \(A + B\), if \(A =\begin{bmatrix}
9 & -4 & 13\\
-7 & 6 & 8\\
9 & 8 & 12
\end{bmatrix}, B = \begin{bmatrix}
3 & 7 & -1\\
3 & -5 & 5\\ 
-9 & 4 & 6
\end{bmatrix}\)

 

\(A + B =\)$\left[\begin{array}{lll}i& i& i\\ i& i& i\\ i& i& i\end{array}\right]$