Practice problem
Adding and Subtracting Matrices
What is [ \begin{bmatrix} 7 & 0 & 16 \ 7 & 20 & 10 \ 13 & 20 & 10 \end{bmatrix}
\begin{bmatrix} 9 & 6 & 6 \ 14 & 8 & 2 \ 14 & 12 & 7 \end{bmatrix} +][+ \begin{bmatrix} 17 & 13 & 7 \ 9 & 1 & 7 \ 13 & 9 & 12 \end{bmatrix}
\begin{bmatrix} 11 & 16 & 9 \ 13 & 5 & 18 \ 14 & 13 & 4 \end{bmatrix}
]