The matrix $$A=\left[\begin{array}{ccc} -2 &0 &1\cr 2 &-1 &-2\cr -1 &0 &0 \end{array}\right]$$ has one real eigenvalue. Find this eigenvalue, its multiplicity, and the dimension of the corresponding eigenspace.

The eigenvalue = has multiplicity = and the dimension of the corresponding eigenspace is .