\operatorname { det } \left( \begin{array} { l l } { 1 } & { 8 } \\ { 9 } & { 7 } \end{array} \right)
Evaluate
-65
Factor
-65
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det(\left(\begin{matrix}1&8\\9&7\end{matrix}\right))
Find the determinant of the matrix.
7-8\times 9
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
7-72
Multiply 8 times 9.
-65
Subtract 72 from 7.
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Limits
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