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# Ques 3 could you show me the workings of this matres?

Mar 8, 2018

$a = - 9$

#### Explanation:

$\text{element a in matrix AB is a result of multiplying the }$
$\text{elements in row 2 of matrix A with the corresponding}$
$\text{elements in column 2 of matrix B}$

$\text{that is }$

$\left(\left(- 6 , - 3 , 0\right)\right) \left(\begin{matrix}6 \\ - 9 \\ - 8\end{matrix}\right)$

$= \left(- 6 \times 6\right) + \left(- 3 \times - 9\right) + \left(0 \times - 8\right)$

$= - 36 + 27 + 0 = - 9$