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Compute the Eigenvalues of the Matrix

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Consider the matrix A = 3 0 0
1 5 1
-2 -4 1
(a) Show that 3 is an eigenvalue of A with algebraic multiplicity 3.
(b) Determine the geometric multiplicity of this eigenvalue.
(c) Find a basis for the eigenspace E3 = (A - 3I).
(d) Find bases for (A - 3I)^2 and (A-3I)^3 so that your basis for (A-3I)^k includes your basis for (A-3I)^(k-1). Do this by solving (A-3I)v = u and (A - 3I)w = v where u is an eigenvector in E3. Note that if your second basis already has 3 vectors, there won't be any additional vectors in the third basis.
(e) From the matrix S who columns are the three vectors in your basis for E3, and compute J = (S^-1)AS. Notice that if you order the columns of S in the most logical way, J will be triangular.
(f) Solve the system y' = Jy.
(g) Find the solution to x' = Ax by multiplying y by the appropriate matrix.

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Solution Summary

The following posting helps compute eigenvalues. The geometric multiplicity of the eigenvalues are provided.

Solution Preview

Part a: In order to compute the eigenvalues of matrix A we need to refer to its characteristic polynomial p(lambda) of A which is equal to:

p(lambda) = ...

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