- Adding & subtracting matricesChoice H$$ \begin{align*} \begin{bmatrix} 9&2 \\ -4&1 \\ \end{bmatrix}+ \begin{bmatrix} -6&8 \\ 7&6 \\ \end{bmatrix}= \begin{bmatrix} 9-6&2+8 \\ -4+7&1+6 \\ \end{bmatrix} \end{align*} $$ $$ \begin{align*} =\begin{bmatrix} 3&10 \\ 3&7 \\ \end{bmatrix} \end{align*} $$
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