Sunday, 9 November 2014

linear algebra - How do I find the characteristic polynomial and eigenvalues?

For the following matrix, compute





  1. its characteristic polynomial

  2. its eigenvalues



A=[010001254]



So I think I know to find the characteristic polynomial, I have to compute det(A-λI) = 0.
Which gives...



AλI=[λ100λ1254λ]




λ|λ154λ|1|0124λ|



After calculating the determinant I get, λ(4λ+λ2+5)+2=0



What do I do next? I'm completely stuck.

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