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Tohaina

det(\left(\begin{matrix}2&4\\-1&2\end{matrix}\right))
Kimihia te tau whakatau o te poukapa.
2\times 2-4\left(-1\right)
Mō te poukapa 2\times 2 \left(\begin{matrix}a&b\\c&d\end{matrix}\right), ko te ad-bc te tau whakatau.
4-4\left(-1\right)
Whakareatia 2 ki te 2.
4-\left(-4\right)
Whakareatia 4 ki te -1.
8
Tango -4 mai i 4.