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If $A=\left[\begin{array}{lll}1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9\end{array}\right]$, find $|A|$
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Verified Answer
$|\mathrm{A}|=\left|\begin{array}{ccc}1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9\end{array}\right|$
$=1(-9+12)-1(-18+15)-2(8-5)=0$.
$=1(-9+12)-1(-18+15)-2(8-5)=0$.
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