Originally Posted by

**Frostking** I need to determine eigen values for the following matrix.

- 3 2 -1

2 2 -6

-1 -6 5

I get Det of A - lambda I =

I will use x instead of lambda

(-3 - x) (2 - x) (5 - x) - 36(-3 - x) - 4 (2 - x) + 10 + x = 0

I know my factoring skills need work, but is there another way besides trial and error to determine my eigenvalues??? I get that lambda (or x as I have used) = -2 is one of my eigen values. I also understand, I think, that I should have two more. Is there a method I am not aware of or a site on the internet that has a tutorial for this process. So far all the ones I have found just use 2 x 2 matrices which are so simple even I can do them!!! Thanks so much for looking at this. Frostking