Question 22

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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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