- #1
bluewhistled
- 31
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Homework Statement
A is
[4 0 1
2 3 2
1 0 4]
Find an invertible P and a diagonal D so that D=P-1AP.
I keep getting two linearly dependent eigenvalues which means it's not diagonal but this problem doesn't state "If it can't be done explain why" or anything like that. So I just want to verify with some of you.
The Attempt at a Solution
I subtract with LI and take the determinant and get:
(L-3)((L-4)^2 - 1)
(L-3)(L^2-8L+16)-(L-3)
L^3-8L^2+16L-3L^2+24L-48-L+3
L^3-11L^2+39L-45
Which I then factor out to be 5, 3, 3.
Am I doing something wrong/missing something?