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det(\left(\begin{matrix}1&-2\\3&5\end{matrix}\right))
Find the determinant of the matrix.
5-\left(-2\times 3\right)
For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.
5-\left(-6\right)
Multiply -2 times 3.
11
Subtract -6 from 5.