How to obtain the eigenvalues when I get the warning that the matrix is singular?

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How can I obtain the row reduction method to get the values for Lamda?
% A
I = eye(2)
m1 = [7 3; 3 -1]
Lamda = 8 % The value for λ
% B
LaI = I * Lamda % Identity matrix - value of λ
m2s = m1 - LaI % Caluculating the new matrix
% C
zc = zeros(size(m2s,1),1) % creating a zero column
m3s = [m2s, zc] % adding the zero column at the end
I tried to use the forward an backward passing method, but there I only get the warning that the matrix is singular.

Answers (1)

Walter Roberson
Walter Roberson on 4 May 2022
% A
I = eye(2)
I = 2×2
1 0 0 1
m1 = [7 3; 3 -1]
m1 = 2×2
7 3 3 -1
syms Lamda % The value for λ
% B
LaI = I * Lamda % Identity matrix - value of λ
LaI = 
m2s = m1 - LaI % Caluculating the new matrix
m2s = 
d = det(m2s)
d = 
eigens = solve(d)
eigens = 

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