Math Is Fun Forum

pari_alf

Member

Registered: 2013-12-01

Posts: 85

eigen values of 2x2 matrix

Hello All,

I am interested to find eigen values .
There are two ways to find eigen values of 2x2 matrix

Let say A is a matrix of size 2x2 ,
A = [2     1]
      [1     2]

1. so ( A - lamda I ) = 0, where I is the identity matrix

2. second way is shown in the attached image

Source:  http://www.soest.hawaii.edu/martel/Cour … ectors.pdf

I can get eigen values from method 1.
But i am failed to get second eigen value from method 2.

Anyone can pls help me.
Thanks

Last edited by pari_alf (2015-04-29 13:52:01)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: eigen values of 2x2 matrix

Hi;

I checked your formula and it gets 3 and 1 as the eigenvalues and that is correct.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.