\left| \begin{array} { c c } { - 16 } & { - 2 } \\ { 20 } & { 5 } \end{array} \right|
Evaluate
-40
Factor
-40
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det(\left(\begin{matrix}-16&-2\\20&5\end{matrix}\right))
Find the determinant of the matrix.
-16\times 5-\left(-2\times 20\right)
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
-80-\left(-2\times 20\right)
Multiply -16 times 5.
-80-\left(-40\right)
Multiply -2 times 20.
-40
Subtract -40 from -80.
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Limits
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