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Problem
Problem
If
A
=
[
−
1
−
2
−
2
2
1
−
2
2
−
2
1
]
A = \begin{bmatrix} -1 & -2 & -2 \\ 2 & 1 & -2 \\ 2 & -2 & 1 \end{bmatrix}
A
=
−
1
2
2
−
2
1
−
2
−
2
−
2
1
, then
adj
A
\text{adj } A
adj
A
equals to a.
A
A
A
b.
A
T
A^T
A
T
c.
3
A
3A
3
A
d.
3
A
T
3A^T
3
A
T
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