Q22 of 98 Page 314

If A is a 3-rowed square matrix and │A│=5 then │adj A│=?

The property states that │adj A│= │A│^n-1

Here n= 3 and │A│=5

│adj A│= │5│^3-1

= │5│²

= 25.

For square matrices A and B of the same order, we have adj(AB)=?

If A is a 3-rowed square matrix and │A│=4 then adj(adj A)=?

For any two matrices A and B,

If A =then A=?