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Tohaina

det(\left(\begin{matrix}7&-8\\9&9\end{matrix}\right))
Kimihia te tau whakatau o te poukapa.
7\times 9-\left(-8\times 9\right)
Mō te poukapa 2\times 2 \left(\begin{matrix}a&b\\c&d\end{matrix}\right), ko te ad-bc te tau whakatau.
63-\left(-8\times 9\right)
Whakareatia 7 ki te 9.
63-\left(-72\right)
Whakareatia -8 ki te 9.
135
Tango -72 mai i 63.