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Problem
Problem
If
A
=
[
5
a
−
b
3
2
]
A = \begin{bmatrix}5a & -b \\ 3 & 2\end{bmatrix}
A
=
[
5
a
3
−
b
2
]
and
adj
A
=
A
A
T
\operatorname{adj} A = AA^T
adj
A
=
A
A
T
, then
5
a
+
b
5a + b
5
a
+
b
is equal
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