How do you solve the Eigenvalue problem for your homework assignments?

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Homework Help Overview

The discussion revolves around the eigenvalue problem, specifically focusing on the expression involving a matrix A and the transformation A^2010 - 2A + 3I. Participants are exploring the implications of eigenvalues and eigenvectors in this context.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are attempting to clarify the definition of eigenvalues and their relationship to matrix transformations. Questions are raised about how to express eigenvalues in terms of matrix equations and the implications of specific eigenvalues on matrix behavior.

Discussion Status

The discussion is active, with participants questioning assumptions and definitions related to eigenvalues. Some guidance has been offered regarding the relationship between eigenvalues and matrix operations, although there is no explicit consensus on the interpretation of the expressions involved.

Contextual Notes

There is a focus on the distinction between matrices and scalar values, with participants noting the importance of maintaining the matrix context when discussing eigenvalues. The original problem statement includes a visual element that is not accessible in the text format.

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Homework Statement
[PLAIN]http://img14.imageshack.us/img14/7826/70745131.jpg

The attempt at a solution
How do I go about solving this problem?
 
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2..
is dis correct!
 
vishal007win said:
2..
is dis correct!

?
 
What does it mean to say that a number lambda is an eigenvalue of a matrix?
 
it means that no. is the eigen value of new matrix formed by the expression..
A^2010 -2A+3I
 
if for an eigen vector,eigen value is 1...dis means for that e-vector, matrix is behaving like an identity matrix...so the same eigen vector this expression will have eigen value :2
 
How did you show it was 2?
 
vishal007win said:
it means that no. is the eigen value of new matrix formed by the expression..
A^2010 -2A+3I
You didn't answer my question. Here's a slightly different question. What does it mean to say that 3 is an eigenvalue of a matrix A?
 
  • #10
matrix can act in two ways ...rotating a vector or changing it length...
this value...(e-value) is a factor by which matrix changes the length of vector...
 
  • #11
Mark44 said:
You didn't answer my question. Here's a slightly different question. What does it mean to say that 3 is an eigenvalue of a matrix A?

hope this give answer to your question!
 
  • #12
I'm looking for an equation that involves A and 3.
 
  • #13
Mark44 said:
I'm looking for an equation that involves A and 3.

Is it:

(A - 3I)x = 0
 
  • #14
Yes, or equivalently, Ax = 3x.

With your problem, you know that 1 is an eigenvalue of A, so Ax = 1x. You are trying to find an eigenvalue of A2010 - 2A + 3I.

(A2010 - 2A + 3I)x = ?x
 
  • #15
Think about the other problem you posted. If Ax = 1x, what are A2x, A3x, A4x, ...?
 
  • #16
All would be 1x
 
  • #17
OK, so what would (A2010 - 2A + 3I)x be?
 
  • #18
Also 1x
 
  • #19
temaire said:
Also 1x
No it isn't.
 
  • #20
Mark44 said:
No it isn't.

Whoops lol, I meant 2.
 
  • #21
So would it be enough to say that since A=1, A^2010 - 2A + 3I = 1 -2 + 3 = 2?
 
  • #22
temaire said:
So would it be enough to say that since A=1, A^2010 - 2A + 3I = 1 -2 + 3 = 2?
No, A is a matrix, so it can't be equal to any number, and A^2010 - 2A + 3I [itex]\neq[/itex] 2

However, you know that Ax = 1x, so (A2010 - 2A + 3I)x = ___x? (Fill in the blank.)
 

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