$$$\left[\begin{array}{cc}2 & 3\\6 & 7\end{array}\right]$$$:n determinantti

Laske $$$\left|\begin{array}{cc}2 & 3\\6 & 7\end{array}\right|$$$.

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

$$$\left|\begin{array}{cc}2 & 3\\6 & 7\end{array}\right| = \left(2\right)\cdot \left(7\right) - \left(3\right)\cdot \left(6\right) = -4$$$

$$$\left|\begin{array}{cc}2 & 3\\6 & 7\end{array}\right| = -4$$$A