\left| \begin{array} { l l } { - 7 } & { 7 } \\ { - 2 } & { 2 } \end{array} \right|
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det(\left(\begin{matrix}-7&7\\-2&2\end{matrix}\right))
Find the determinant of the matrix.
-7\times 2-7\left(-2\right)
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
-14-7\left(-2\right)
Multiply -7 times 2.
-14-\left(-14\right)
Multiply 7 times -2.
0
Subtract -14 from -14.
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