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TS EAMCET 5 May 2018 Shift 2 Solved Paper
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© examsnet.com
Question : 4
Total: 160
If
A
=
[
1
2
2
2
1
2
2
2
1
]
then
A
−
1
=
4
I
−
A
A
−
4
I
1
5
(
A
−
4
I
)
1
5
(
4
I
−
A
)
Validate
Solution:
Consider the matrix
A
=
[
1
2
2
2
1
2
2
2
1
]
So,
|
A
|
=
−
3
+
4
+
4
=
5
Therefore,
A
−
1
=
1
|
A
|
[
Adj
A
]
=
1
5
[
−
3
2
2
2
−
3
2
2
2
−
3
]
=
1
5
[
1
2
2
2
1
2
2
2
1
]
−
1
5
[
4
0
0
0
4
0
0
0
4
]
A
−
1
=
1
5
[
A
−
4
I
]
© examsnet.com
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