Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.2: Exponents And Radicals
Problem 44E
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Question
Orthogonally diagonalize the matrices by finding an orthogonal matrix Q and a diagonal matrix D such that QT AQ = D.
Expert Solution
Step 1
Given,
Step 2
To find eigen values,
set det(A-λI) = 0
It gives eigen values -2, 4, and 5.
Step 3
To find eigenvector corresponding to eigen value -2
5x = -2x shows that x = 0 is the solution.
From second and third equations,
Thus, x = 0, z = y
Step 4
To find eigenvector corresponding to eigen value -4
5x = 4x shows that x = 0 is the solution.
From second and third equations,
y +3z = 4y
3z =3y
z=y
3y + z = 4z
3y = 3z
Thus, x =0, and z = y, z =y
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