Question

[2 1 1
Find the (adjA) if A= 3 2 - 4
0 - 1 2​

Answer 1

Answer:

Step-by-step explanation:

A=  

∣

∣

∣

∣

∣

∣

∣

∣

​  

 

3

4

0

​  

 

2

−1

1

​  

 

1

2

2

​  

 

∣

∣

∣

∣

∣

∣

∣

∣

​  

 

=3(−2−2)−2(8)+1(4)=−12−16+4=−24

For a matrix A

adj(adjA)=∣A∣  

n−1

A

where n is its order

∴ adj(adj A)=(−24)  

3−1

=(−24)  

2

=576A