Answer
$\begin{bmatrix}10\end{bmatrix}$
Work Step by Step
We have: $E(AF)=\begin{bmatrix}4 & 2\end{bmatrix} (\begin{bmatrix}3 & 0 \\-1 & 5\end{bmatrix} \cdot \begin{bmatrix}-1\\2 \end{bmatrix})$
$=\begin{bmatrix}4 & 2\end{bmatrix} (\begin{bmatrix}-3 -0 \\1+10\end{bmatrix})$
After simplification, we obtain:
$=\begin{bmatrix}-12+22\end{bmatrix}$
$=\begin{bmatrix}10\end{bmatrix}$
