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CBSE Class 12 Math 2011 Solved Paper

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Question : 5
Total: 29
Write A−1 for A = [
25
13
]
Solution:  
A = [
25
13
]
A−1 =
1
|A|
[
3−5
−12
]
=
1
[(2×3)−(1×5)]
 [
3−5
−12
]
=
1
(6−5)
 [
3−5
−12
]
A−1 = [
3−5
−12
]
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