function []=prob_9_2_9()
%
% Written by:
% -- 
% John L. Weatherwax                2006-12-17
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----
  
clc; close all; 

APlusB = [ 1 10; 10 1 ]; 
eig(APlusB)

ATimesB = [ 101 10; 10 101 ]; 
eig(ATimesB)