(a) Consider the matrix A that reflects a vector in the line y = 3x. (i) Explain in words (without computing any eigenvalues or eigenvectors) why A can be diagonalized to give the matrix D where D = (ii) Find a change of basis martrix P such that P-'AP – D, without solving the eigenvalue problem. (b) Consider the matrix B that orthogonally projects a vector onto the line y - 3x. (i) Explain in words (without computing any eigenvalues or eigenvectors) why B can be diagonalized to give the matrix D where D = (ii) Find a change of basis matrix P such that P'AP = D, without solving the eigenvalue problem.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter5: Orthogonality
Section5.4: Orthogonal Diagonalization Of Symmetric Matrices
Problem 27EQ
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(a) Consider the matrix A that reflects a vector in the line y = 3x.
(i) Explain in words (without computing any eigenvalues or eigenvectors) why A can be diagonalized
to give the matrix D where
D =
(ii) Find a change of basis martrix P such that P-AP – D, without solving the eigenvalue problem.
(b) Consider the matrix B that orthogonally projects a vector onto the line y -3x.
(i) Explain in words (without computing any eigenvalues or eigenvectors) why B can be diagonalized
to give the matrix D where
D =
(ii) Find a change of basis matrix P such that P-'AP = D, without solving the eigenvalue problem.
Transcribed Image Text:(a) Consider the matrix A that reflects a vector in the line y = 3x. (i) Explain in words (without computing any eigenvalues or eigenvectors) why A can be diagonalized to give the matrix D where D = (ii) Find a change of basis martrix P such that P-AP – D, without solving the eigenvalue problem. (b) Consider the matrix B that orthogonally projects a vector onto the line y -3x. (i) Explain in words (without computing any eigenvalues or eigenvectors) why B can be diagonalized to give the matrix D where D = (ii) Find a change of basis matrix P such that P-'AP = D, without solving the eigenvalue problem.
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