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

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

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

$$$\left|\begin{array}{cc}2 t & t\\2 & 1\end{array}\right| = \left(2 t\right)\cdot \left(1\right) - \left(t\right)\cdot \left(2\right) = 0$$$

$$$\left|\begin{array}{cc}2 t & t\\2 & 1\end{array}\right| = 0$$$A