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Problems
6. If
A
=
[
1
1
−
2
2
1
−
3
5
4
−
9
]
\mathrm{A}=\left[\begin{array}{lll}1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9\end{array}\right]
A
=
1
2
5
1
1
4
−
2
−
3
−
9
…
Mathematics
Problem
6. If
A
=
[
1
1
−
2
2
1
−
3
5
4
−
9
]
\mathrm{A}=\left[\begin{array}{lll}1 & 1 & -2 \\ 2 & 1 & -3 \\ 5 & 4 & -9\end{array}\right]
A
=
1
2
5
1
1
4
−
2
−
3
−
9
, find
∣
A
∣
|\mathrm{A}|
∣
A
∣
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