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Question
If \[A = \begin{bmatrix}4 & 3 \\ 1 & 2\end{bmatrix} and B = \binom{ - 4}{ 3}\]
write AB.
Sum
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Solution
\[AB = \begin{bmatrix}4 & 3 \\ 1 & 2\end{bmatrix}\binom{ - 4}{3}\]
\[ \Rightarrow AB = \binom{ - 16 + 9}{ - 4 + 6}\]
\[ \Rightarrow AB = \binom{ - 7}{2}\]
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