$$$\left[\begin{array}{cc}-4 & 0\\2 & 1\end{array}\right]$$$:n determinantti
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Syötteesi
Laske $$$\left|\begin{array}{cc}-4 & 0\\2 & 1\end{array}\right|$$$.
Ratkaisu
2x2-matriisin determinantti on $$$\left|\begin{array}{cc}a & b\\c & d\end{array}\right| = a d - b c$$$.
$$$\left|\begin{array}{cc}-4 & 0\\2 & 1\end{array}\right| = \left(-4\right)\cdot \left(1\right) - \left(0\right)\cdot \left(2\right) = -4$$$
Vastaus
$$$\left|\begin{array}{cc}-4 & 0\\2 & 1\end{array}\right| = -4$$$A
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