Question
Evaluate $7\left[\begin{array}{cc}-1 & 2 \\ 0 & 1\end{array}\right]$
✓
Answer
$7\left[\begin{array}{cc}-1 & 2 \\ 0 & 1\end{array}\right]=\left[\begin{array}{cc}-7 & 14 \\ 0 & 7\end{array}\right]$
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