Question

A square matrix a of order 3 has determine if a is equal to 5 find determinant of a doubt adjoint of a

Answer 1

As we know that

det(adj(adjA))= detA^n-2

where n is the order of the square matrix.

Here, detA =5

therefore det(adj(adjA))= 5^3-2=5^1=5.

Answer 2

As we know that

det(adj(adjA))= detA^n-2

where n is the order of the square matrix.

Here, detA =5

therefore det(adj(adjA))= 5^3-2=5^1=5.