Question
Additive inverse of matrix $\left[\begin{array}{rr}-1 & 2 \\ 0 & -4 \\ 3 & 1\end{array}\right]$ is ________
✓
Answer
$\left[\begin{array}{cc}1 & -2 \\ 0 & 4 \\ -3 & -1\end{array}\right]$
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