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Question
If A = `[(-2,0,0),(1,2,3),(5,1,-1)]`, then the value of | A (adj. A) | is ______.
Options
100 I
10 I
10
1000
MCQ
Fill in the Blanks
Solution
If A = `[(-2,0,0),(1,2,3),(5,1,-1)]`, then the value of | A (adj. A) | is 10 I.
Explanation:
A = `[(-2,0,0),(1,2,3),(5,1,-1)]`
adj(A) = `[(-5,0,0),(16,0,6),(-9,2,-4)]`
A. adj(A) = `[(10,0,0),(0,10,0),(0,0,10)]`
|A. adj(A)| = 10 I
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