\begin{pmatrix} 2 & 2 \\ 7 & -39 \end{pmatrix}
Question:
Compute $\begin{pmatrix} 2 & 3 \\ 7 & -1 \end{pmatrix} \begin{pmatrix} 1 & -5 \\ 0 & 4 \end{pmatrix}.$
Answer:
Let's think step by step.

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\begin{pmatrix} 2 & 2 \\ 7 & -39 \end{pmatrix}
Compute $\begin{pmatrix} 2 & 3 \\ 7 & -1 \end{pmatrix} \begin{pmatrix} 1 & -5 \\ 0 & 4 \end{pmatrix}.$
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