Question

Find the value of -6 -3 -5 5 7 -6 3 9 9

Answer 1

Given

To use Sarrus we must copy the first two columns

And the determinant will be

Doing the simplification

`\begin{gathered} -549-(+84) \\ -549-84 \\ \\ -633 \end{gathered}`

Therefore, the determinant is -633.