4. In each part below, A is a 2 x 2 matrix of real numbers (and I is the 2 x 2 identity). (a) Suppose A² – 5A + 61 = 0. Show that any eigenvalue of A must equal either 2 or 3. (b) Suppose A has both 2 and 3 as eigenvalues. Show that A² – 5A+6I = 0. (Hint: Show that each eigenvector belongs to Null(A² – 5A+ 61).) (c) Find an A whose only eigenvalues lie in {2,3} but where A2 -5A+61 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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i would like help with question 4

4. In each part below, A is a 2 x 2 matrix of real numbers (and I is the 2 x 2 identity).
(a) Suppose A² – 5A + 61 = 0. Show that any eigenvalue of A must equal either 2
or 3.
(b) Suppose A has both 2 and 3 as eigenvalues. Show that A² – 5A+6I = 0. (Hint:
Show that each eigenvector belongs to Null(A² – 5A+ 61).)
(c) Find an A whose only eigenvalues lie in {2,3} but where A2 -5A+61 0.
Transcribed Image Text:4. In each part below, A is a 2 x 2 matrix of real numbers (and I is the 2 x 2 identity). (a) Suppose A² – 5A + 61 = 0. Show that any eigenvalue of A must equal either 2 or 3. (b) Suppose A has both 2 and 3 as eigenvalues. Show that A² – 5A+6I = 0. (Hint: Show that each eigenvector belongs to Null(A² – 5A+ 61).) (c) Find an A whose only eigenvalues lie in {2,3} but where A2 -5A+61 0.
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