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  4. If A=[1-2 3], B=[2 -3 -1], then A B is equal to

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Q. If $A=\begin{bmatrix}1-2 & 3\end{bmatrix}, B=\begin{bmatrix}2 \\ -3 \\ -1\end{bmatrix}$, then $A B$ is equal to

Matrices

Solution:

$A B=\begin{bmatrix}1 & -2 & 3\end{bmatrix}\begin{bmatrix}2 \\-3 \\-1\end{bmatrix}=[2+6-3]=[5]$