% EX5_3.M Check Example 5.3 
%  Requires Symbolic Math Toolbox to  
%   solve 'lam^2 +b*lam +c =0'
%
lam=solve('l^2+b*l+c=0','l')
%
%  Try the command dsolve on the differential equation
%     y''+b*y'+c*y=0
%