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Mathematics
Mathematics
Problem
If
A
=
[
1
3
3
1
4
3
1
3
4
]
A = \begin{bmatrix} 1 & 3 & 3 \\ 1 & 4 & 3 \\ 1 & 3 & 4 \end{bmatrix}
A
=
1
1
1
3
4
3
3
3
4
, then verify that
A
adj
A
=
∣
A
∣
I
A \text{ adj } A = |A| I
A
adj
A
=
∣
A
∣
I
. Also find
A
−
1
A^{-1}
A
−
1
.
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