Given 
, compute A – 1 and show that 2A – 1 = 9I – A.
A = 
|A| = 14 – 12 = 2 adj A = 
A – 1 = 
To Show: 2A – 1 = 9I – A
L.H.S 2A – 1 = 2.
R.H.S 9I – A = 
= 
Hence, 2A – 1 = 9I – A
12
Given , compute A – 1 and show that 2A – 1 = 9I – A.
A =
|A| = 14 – 12 = 2 adj A =
A – 1 =
To Show: 2A – 1 = 9I – A
L.H.S 2A – 1 = 2.
R.H.S 9I – A =
=
Hence, 2A – 1 = 9I – A