\left| \begin{array} { c c } { - 9 } & { 3 } \\ { 7 } & { 2 } \end{array} \right|
Evaluate
-39
Factor
-39
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det(\left(\begin{matrix}-9&3\\7&2\end{matrix}\right))
Find the determinant of the matrix.
-9\times 2-3\times 7
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
-18-3\times 7
Multiply -9 times 2.
-18-21
Multiply 3 times 7.
-39
Subtract 21 from -18.
Examples
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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