Evaluate: [ lll 2 & -1 & 3 ] [ l 4 3 1 ]

Question

Evaluate$: \left[\begin{array}{lll}2 & -1 & 3\end{array}\right]\left[\begin{array}{l}4 \\ 3 \\ 1\end{array}\right]$

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Answer

$\left[\begin{array}{lll}2 & -1 & 3\end{array}\right]\left[\begin{array}{l}4 \\ 3 \\ 1\end{array}\right]$
$= [2(4)-1(3)+ 3(1)] $
$= [8 – 3 + 3] $
$= [8]$

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