$$$\left[\begin{array}{cc}1 & 3\\-2 & 5\end{array}\right]$$$:n determinantti

Laske $$$\left|\begin{array}{cc}1 & 3\\-2 & 5\end{array}\right|$$$.

2x2-matriisin determinantti on $$$\left|\begin{array}{cc}a & b\\c & d\end{array}\right| = a d - b c$$$.

$$$\left|\begin{array}{cc}1 & 3\\-2 & 5\end{array}\right| = \left(1\right)\cdot \left(5\right) - \left(3\right)\cdot \left(-2\right) = 11$$$

$$$\left|\begin{array}{cc}1 & 3\\-2 & 5\end{array}\right| = 11$$$A