Hi,

I am totally lost in how I am meant to solve this.

I have to find the eigen values of the matrix

$\displaystyle \left[\begin{array}{cc}1&1\\1&2\end{array}\right]$

I then find $\displaystyle det(B - \lambda I) = \left[\begin{array}{cc}1 - \lambda &1\\1&2 - \lambda \end{array}\right]$

$\displaystyle = (1 - \lambda )(2 - \lambda ) - (1\cdot1)$

From there it starts to get messy, I just want to know if I am doing anything wrong.