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WAEC Further Mathematics 2020 Paper
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© africaexams.com
Question : 2
Total: 39
Find the inverse of
(
3
5
1
2
)
(
5
1
−
3
2
)
(
2
−
5
−
1
3
)
(
−
5
2
−
1
3
)
(
5
1
2
3
)
Validate
Solution:
Let
A
=
(
3
5
1
2
)
|
A
|
=
(
3
×
2
−
5
×
1
)
=
6
−
5
=
1
A
−
1
=
(
2
−
5
−
1
3
)
© africaexams.com
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