Jambmaths question:
If $Q=\left( \begin{matrix} 9 & -2 \\ -7 & 4 \\\end{matrix} \right),\text{then }\left| Q \right|\text{is}$
Jamb Maths Solution:
\[\left| Q \right|=\left| \begin{matrix} 9 & -2 \\ -7 & 4 \\\end{matrix} \right|=(9\times 4)-(-2\times -7)=36-14=22\]
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