Question

Evaluate:
$\left[\begin{array}{ccc}3& 4& 1\end{array}\right]\left[\begin{array}{c}3\\ -1\\ 3\end{array}\right]=[?]$

Answer 1

Since,

$\left[\begin{array}{ccc}3& 4& 1\end{array}\right]\left[\begin{array}{c}3\\ -1\\ 3\end{array}\right]=\left[\right(3\times 3)+(4\times (-1))+(1\times 3\left)\right]$

$[=9-4+3]$

$[=12-4]$

$[=8]$