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Determinant van $$$\left[\begin{array}{cc}1 & 2\\7 & 8\end{array}\right]$$$
Gerelateerde rekenmachine: Rekenmachine voor cofactormatrix
Uw invoer
Bereken $$$\left|\begin{array}{cc}1 & 2\\7 & 8\end{array}\right|$$$.
Oplossing
De determinant van een 2x2-matrix is $$$\left|\begin{array}{cc}a & b\\c & d\end{array}\right| = a d - b c$$$.
$$$\left|\begin{array}{cc}1 & 2\\7 & 8\end{array}\right| = \left(1\right)\cdot \left(8\right) - \left(2\right)\cdot \left(7\right) = -6$$$
Antwoord
$$$\left|\begin{array}{cc}1 & 2\\7 & 8\end{array}\right| = -6$$$A
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