Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Let 
and 
where a and b area real numbers. Which of the following options is/are correct?
A
(adj M) -1 + adj M -1 = -M
B
If 
,then 
,then
C
det(adjM 2 ) = 81
D
a + b = 3
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, d)
M adj M = |M| I 
a = 2, b = 1
(adj M) -1 + (adj M -1 ) = (|M|M -1 ) -1 + |M -1 | M = 
= - M
|adjM 2 | -|M 2 | 2 -|M| 4 =16
a = 2,b=1, a + b = 3
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