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AP EAPCET 05-Jul-2022 Shift 1 Paper
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© examsnet.com
Question : 3
Total: 160
If
A
=
[
3
−
3
4
2
−
3
4
0
−
1
1
]
, then
A
A
T
is a
Symmetric matrix
Skew-Symmetric matrix
Singular matrix
Inverse of A
Validate
Solution:
👈: Video Solution
Here,
A
=
[
3
−
3
4
2
−
3
4
0
−
1
1
]
A
T
=
[
3
2
0
−
3
−
3
−
1
4
4
1
]
A
A
T
=
[
3
−
3
4
2
−
3
4
0
−
1
1
]
[
3
2
0
−
3
−
3
−
1
4
4
1
]
A
A
T
=
[
9
+
9
+
16
6
+
9
+
16
0
+
3
+
4
6
+
9
+
16
4
+
9
+
16
0
+
3
+
4
0
+
3
+
4
0
+
3
+
4
0
+
1
+
1
]
A
A
T
=
[
34
31
7
31
29
7
7
7
2
]
(
A
A
T
)
T
=
[
34
31
7
31
29
7
7
7
2
]
So,
A
A
T
is a symmetric matrix.
© examsnet.com
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