Homework Statement
Find the eigenvalues of A, when A =[3,1,1; 0,5,0; -2,0,1]
Homework Equations
The Attempt at a Solution
I took the det(A-\lambdaI)=0 and found the characteristic polynomial to be:
-\lambda^{3}+15\lambda^{2}-73\lambda+115
I couldn't figure out whole...