Hi!

I need help finding the eigenvalues of a 4x4 matrix. Been working with the same problem for 2 days now. I just can't solve it. Help me pls!

The matrix (A) is:

(Notice that the matrix is symmetric, if that is to any help)

I have come this far (If I'm on the right track).

det = 0

How do I solve for L from this? I would appreciate any help.

Thanks!

/Gordina