Chapter 5, Supplementary Exercises, Question 16a Suppose that a 4 x 4 matrix A has eigenvalues A, = 1, 12 = - 3, 13 = 5, and A4 = - 5. Use the following method to find det (A). If P(A) = det (AI - A) = ^^ + c¿A" - + ... + Cn So, on setting A = 0, we obtain that det (- A) = c, or det (A) = (- 1)"cn det (A) =

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.1: Introduction To Eigenvalues And Eigenvectors
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Chapter 5, Supplementary Exercises, Question 16a
Suppose that a 4 x 4 matrix A has eigenvalues A, = 1, 12 = - 3, 13 = 5, and 14 = - 5. Use the following method to find det (A).
If
1
p(A) = det (AI – A) = A" + c,An -
+ ... + Cn
So, on setting A = 0, we obtain that
det (- A) = cn or det (A) = (- 1)"cn
det (A) =
Transcribed Image Text:Chapter 5, Supplementary Exercises, Question 16a Suppose that a 4 x 4 matrix A has eigenvalues A, = 1, 12 = - 3, 13 = 5, and 14 = - 5. Use the following method to find det (A). If 1 p(A) = det (AI – A) = A" + c,An - + ... + Cn So, on setting A = 0, we obtain that det (- A) = cn or det (A) = (- 1)"cn det (A) =
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