[2 1 4. Let A = 1 1 -1 2 -1 2 Show that the characteristic polynomial fa of A is -X³ + 5A² – 21 – 8. Note: fa factors as -(A – 4)(A – 2)(A + 1). You don't have to show this. 4 0 0 2 (b) Let D = Find an orthogonal matrix S so that A = SDS". 0 0 Express e in coordinates with respect to the columns of S.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 16EQ
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1
2
4. Let A = |1
1
-1
-1
2
Show that the characteristic polynomial fa of A is –X3 + 5A² – 21 – 8.
(a)
Note: fa factors as -(A – 4)(A – 2)(A + 1). You don't have to show this.
| 4 0
0 2
(b)
Let D =
. Find an orthogonal matrix S so that A = SDS".
-1
(c)
Express ei in coordinates with respect to the columns of S.
Transcribed Image Text:1 2 4. Let A = |1 1 -1 -1 2 Show that the characteristic polynomial fa of A is –X3 + 5A² – 21 – 8. (a) Note: fa factors as -(A – 4)(A – 2)(A + 1). You don't have to show this. | 4 0 0 2 (b) Let D = . Find an orthogonal matrix S so that A = SDS". -1 (c) Express ei in coordinates with respect to the columns of S.
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