let M be a 3x3 matrix and let s be a eigen vector
Ms = lambda * s
(M-identity * lambda)s = 0
Why is determinant of (M - identity * lambda) equal to zero? I don't know understand that at all, can someone please explain to me in a simple and easy to understand way please. I've seen some youtube videos but they start talking about eigen space and stuff like which i've never heard of