Let the three eigenvalues of a matrix of order 3 be - 1,2,4, then what are the three eigenvalues of a *?

Let the three eigenvalues of a matrix of order 3 be - 1,2,4, then what are the three eigenvalues of a *?

The eigenvalue of a is a, and the eigenvalue of a * is | a | / A
|A|=-8
So: the eigenvalues of a * are 8, - 4, - 2