\begin{pmatrix} -5 \\ 9 \\ -8 \end{pmatrix}
Question:
Find $\begin{pmatrix} -5 \\ 1 \\ -4 \end{pmatrix} + \begin{pmatrix} 0 \\ 8 \\ -4 \end{pmatrix}.$
Answer:
Let's think step by step.

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\begin{pmatrix} -5 \\ 9 \\ -8 \end{pmatrix}
Find $\begin{pmatrix} -5 \\ 1 \\ -4 \end{pmatrix} + \begin{pmatrix} 0 \\ 8 \\ -4 \end{pmatrix}.$
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