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Determinant van $$$\left[\begin{array}{cc}3 & 1\\-7 & 2\end{array}\right]$$$
Gerelateerde rekenmachine: Rekenmachine voor cofactormatrix
Uw invoer
Bereken $$$\left|\begin{array}{cc}3 & 1\\-7 & 2\end{array}\right|$$$.
Oplossing
De determinant van een 2x2-matrix is $$$\left|\begin{array}{cc}a & b\\c & d\end{array}\right| = a d - b c$$$.
$$$\left|\begin{array}{cc}3 & 1\\-7 & 2\end{array}\right| = \left(3\right)\cdot \left(2\right) - \left(1\right)\cdot \left(-7\right) = 13$$$
Antwoord
$$$\left|\begin{array}{cc}3 & 1\\-7 & 2\end{array}\right| = 13$$$A
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