Good evening!

I've come across some matrix problems, as I am currently dealing with some physics work in my field.

I have a variety of real-number 3x3 matricies that I would need to diagonalize, which can take a lot of scribbling time with scrap paper.
(i.e. Any square matrix A = PDP^-1) Is there a way I can get excel to produce the eigenvalues for me? Ideally I would have a function where I could input the 3x3 array and it would produce the diagonal elements for me.

Thanks! Bryan