Let  A=[-2 2 2; 2 1 4; 2 4 1]  and v1=[2 1 -2] a. show that v1 is an eigenvector of A. What is the eigenvalue? b. Find a basis for the  λ-eigenspace, where λ is the eigenvalue of v1. What is the algebraic multiplicity of  λ? c. Use the trace and /or determinant properties of eigenvalues, trace(A) = λ1+λ2+....+λn,   det A=λ1λ2..,...λn  to determine  the remaining eigenvalues(s) of A.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.1: Introduction To Eigenvalues And Eigenvectors
Problem 36EQ: Consider again the matrix A in Exercise 35. Give conditions on a, b, c, and d such that A has two...
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Let  A=[-2 2 2; 2 1 4; 2 4 1]  and v1=[2 1 -2]

a. show that v1 is an eigenvector of A. What is the eigenvalue?

b. Find a basis for the  λ-eigenspace, where λ is the eigenvalue of v1. What is the algebraic multiplicity of  λ?

c. Use the trace and /or determinant properties of eigenvalues,

trace(A) = λ1+λ2+....+λn,   det A=λ1λ2..,...λn 

to determine  the remaining eigenvalues(s) of A.

d. Find an orthogonal matrix P and a diagonal matrix D diagonalising A

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