Give an example of a 3 x 3 matrix with eigenvalues of 2, 2, and -3 that is NOT diagonalizable. Show WHY it is not diagonalizable.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Give an example of a 3 x 3 matrix with eigenvalues of 2, 2, and -3 that is NOT
diagonalizable. Show WHY it is not diagonalizable.
Transcribed Image Text:Give an example of a 3 x 3 matrix with eigenvalues of 2, 2, and -3 that is NOT diagonalizable. Show WHY it is not diagonalizable.
Expert Solution
Step 1

Consider the matrix

21202100-3

Since the given matrix is in upper triangular form , so the eigen values are nothing but its diagonal elements.

The eigen values of A are 2,2,-3. The algebraic multiplicity (A.M) of eigen value 2 is 2.

The eigen vector of the matrix corresponding to eigen value λ=2 is a non-zero solution X such that

A-λIX=0A-2IX=0  

where I is the identity matrix.

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