\left| \begin{array} { l l } { 3 } & { 1 } \\ { 9 } & { 3 } \end{array} \right|
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det(\left(\begin{matrix}3&1\\9&3\end{matrix}\right))
Find the determinant of the matrix.
3\times 3-9
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
9-9
Multiply 3 times 3.
0
Subtract 9 from 9.
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