Answer & explanation
Correct answer: option 3
a+b = 2
$\Rightarrow (a+b)B = 2\begin{bmatrix}
4 & 0 \\
1 & 5
\end{bmatrix}$
$\begin{bmatrix}
8 & 0 \\
2 & 10
\end{bmatrix}$
Correct answer: option 3
a+b = 2
$\Rightarrow (a+b)B = 2\begin{bmatrix}
4 & 0 \\
1 & 5
\end{bmatrix}$
$\begin{bmatrix}
8 & 0 \\
2 & 10
\end{bmatrix}$