Row 1, column 1:
Hint: Row 1 of $A$ is $\begin{pmatrix} 5 & 4 \end{pmatrix}$. Column 1 of $B$ is $\begin{pmatrix} -11 \\ 0 \end{pmatrix}$. Multiply in pairs and add the results.
Row 1, column 2:
Hint: Row 1 of $A$ is $\begin{pmatrix} 5 & 4 \end{pmatrix}$. Column 2 of $B$ is $\begin{pmatrix} 8 \\ -7 \end{pmatrix}$. Multiply in pairs and add the results.
Row 1, column 3:
Hint: Row 1 of $A$ is $\begin{pmatrix} 5 & 4 \end{pmatrix}$. Column 3 of $B$ is $\begin{pmatrix} 0 \\ 11 \end{pmatrix}$. Multiply in pairs and add the results.
Row 2, column 1:
Hint: Row 2 of $A$ is $\begin{pmatrix} -11 & -10 \end{pmatrix}$. Column 1 of $B$ is $\begin{pmatrix} -11 \\ 0 \end{pmatrix}$. Multiply in pairs and add the results.
Row 2, column 2:
Hint: Row 2 of $A$ is $\begin{pmatrix} -11 & -10 \end{pmatrix}$. Column 2 of $B$ is $\begin{pmatrix} 8 \\ -7 \end{pmatrix}$. Multiply in pairs and add the results.
Row 2, column 3:
Hint: Row 2 of $A$ is $\begin{pmatrix} -11 & -10 \end{pmatrix}$. Column 3 of $B$ is $\begin{pmatrix} 0 \\ 11 \end{pmatrix}$. Multiply in pairs and add the results.
Row 3, column 1:
Hint: Row 3 of $A$ is $\begin{pmatrix} -9 & 12 \end{pmatrix}$. Column 1 of $B$ is $\begin{pmatrix} -11 \\ 0 \end{pmatrix}$. Multiply in pairs and add the results.
Row 3, column 2:
Hint: Row 3 of $A$ is $\begin{pmatrix} -9 & 12 \end{pmatrix}$. Column 2 of $B$ is $\begin{pmatrix} 8 \\ -7 \end{pmatrix}$. Multiply in pairs and add the results.
Row 3, column 3:
Hint: Row 3 of $A$ is $\begin{pmatrix} -9 & 12 \end{pmatrix}$. Column 3 of $B$ is $\begin{pmatrix} 0 \\ 11 \end{pmatrix}$. Multiply in pairs and add the results.