If A =
then adj A=?
To find adj A we will first find the cofactor matrix
C11 = 3 C12 = -1
C21= -5 C22 = 2
Cofactor matrix A = 
Adj A =
’
= 
1
If A =then adj A=?
To find adj A we will first find the cofactor matrix
C11 = 3 C12 = -1
C21= -5 C22 = 2
Cofactor matrix A =
Adj A =’
=