Question

If $A$ is a non-singular square matrix of order $3\times 3,$ find $|adjA|$

Answer 1

We know that $|adj\left(A\right)|=|A{|}^{n-1}$

where n is the order of matrix A

Here $n=3$, $|adj\left(A\right)|=|A{|}^{3-1}=|A{|}^2$.