Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If A = 
, then adj (3A 2 + 12A) is equal to
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Sol. A = 
A 2 – 3A – 10 Ι = 0
A 2 = 3A + 10 Ι
3A 2 + 12A = 3(3A + 10 Ι ) + 12A = 21A + 30 Ι
21A + 30 Ι = 
= 
adj (21A + 30 Ι ) = 
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