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bakin
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linear algebra diagonalization :(
determine whether the given matrix is diagonalizable. where possible, find a matrix S such that
S-1AS=Diag(λ1+λ2,...,λn)
I was able to find the eigenvalues, which are λ=1,-4,4. This is given in the back of the book as well, which matched up evenly.
Now, I'm having trouble finding the matrix S. I know I need to find the eigenvectors, and place them as columns in an n x n matrix.
When I plug 1 in, say, I come up with
0 0 0
0 2 7
1 1 -4
And for 4 I came up with
-3 0 0
0 -1 7
1 1 -7
Neither of them seem to be coming out right.
The answer in the back of the book is:
15 0 0
-7 7 1 = S
2 1 -1
Thanks, all.
Homework Statement
determine whether the given matrix is diagonalizable. where possible, find a matrix S such that
S-1AS=Diag(λ1+λ2,...,λn)
Homework Equations
The Attempt at a Solution
I was able to find the eigenvalues, which are λ=1,-4,4. This is given in the back of the book as well, which matched up evenly.
Now, I'm having trouble finding the matrix S. I know I need to find the eigenvectors, and place them as columns in an n x n matrix.
When I plug 1 in, say, I come up with
0 0 0
0 2 7
1 1 -4
And for 4 I came up with
-3 0 0
0 -1 7
1 1 -7
Neither of them seem to be coming out right.
The answer in the back of the book is:
15 0 0
-7 7 1 = S
2 1 -1
Thanks, all.