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Hi, can you please help me solve question number 9

Hi, can you please help me solve question number 9
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Hi, can you please help me solve question number 9

Hi, can you please help me solve question number 9-example-1
User Daniel Ochoa
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\begin{gathered} \begin{pmatrix}3 & 2 & -1\end{pmatrix}*\begin{pmatrix}5 & -1 & -1\end{pmatrix} \\ =\begin{pmatrix}2\mleft(-1\mright)-\mleft(-1\cdot\mleft(-1\mright)\mright) & -1\cdot\: 5-3\mleft(-1\mright) & 3\mleft(-1\mright)-2\cdot\: 5\end{pmatrix} \\ =\begin{pmatrix}-3 & -2 & -13\end{pmatrix} \end{gathered}

User Majid Hojati
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