|A - λ Id|=0
\((\lambda-1) (\lambda-1) (\lambda+ 2) = 0\)
==>μalg(-2)=1
\(\small\left(\begin{array}{rrrr}\lambda=&-2&\left(\begin{array}{rrr}3&0&0\\0&-3&-6\\0&3&6\\\end{array}\right)&\left(\begin{array}{r}x1\\x2\\x3\\\end{array}\right) = 0\\\lambda=&1&\left(\begin{array}{rrr}0&0&0\\0&-6&-6\\0&3&3\\\end{array}\right)&\left(\begin{array}{r}x1\\x2\\x3\\\end{array}\right) = 0\\\end{array}\right)\)
===>μgeo(-2)=1