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Jimmy84
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Homework Statement
In each case describe the eigenvalues of the linear operator and a base in R^3 that consist of eigenvectors of the given linear operator.
Write the matrix of the operator with respect to the given base.
The Orthogonal Projection on the plane 2x + y = 0
and the Symmetry with respect to the plane x - y +2z = 0
Homework Equations
The Attempt at a Solution
I have no idea where to start, with the projection problem my guess is starting by getting a base of 2x + y =0
Then I'm thinking about using Gramm Schmidt to get orthogonal bases of the given plane. but I don't have a clear idea of how to solve this problem I would appreciate any help and advice thanks a lot.