Q33 of 98 Page 314

If A is singular then A(adjA)=?

A(adjA)= A(│A│ x A^-1)

Since determinant of singular matrix is always 0

A(adjA)= 0

So, it is a null matrix.

The matrix A=is

For any 2-rowed square matrix A, if A(adjA) = then the value of │A│ is

If A =then │A^-1│=?