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Homework Help: EigenValues and EigenVectors.

  1. Apr 24, 2013 #1
    1. The problem statement, all variables and given/known data
    Find the eigenvalues and eigenvectors of P = {(0.8 0.6), (0.2 0.4)}. Express {(1), (0)} and {(0), (1)} as sums of eigenvectors.

    2. Relevant equations
    Row ops and det(P - λI) = 0.

    3. The attempt at a solution
    I've found the eigenvectors and eigenvalues of P to be 1 with t{(3), (1)} and 0.2 with q{(-1), (1)} were t and q are arbitrary (parameters). How do I express the two other vectors (in the question statement) as sums of eigenvectors? Thanks.
  2. jcsd
  3. Apr 24, 2013 #2


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    Unless there's another condition you need to satisfy, you can take t=q=1, so the problem is asking you now to solve
    $$\begin{pmatrix} 1 \\ 0 \end{pmatrix} = a\begin{pmatrix} 3 \\ 1 \end{pmatrix}+b\begin{pmatrix} -1 \\ 1 \end{pmatrix}$$ which is just a system of two equations and two unknowns. And then do the same thing for the other vector.
  4. Apr 24, 2013 #3
    Cool. Got it now. Thanks!
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