% Linear Algebra: Theory and Applications
% Ward Cheney & David Kincaid
% JBPub.com (c) 2008 
% File: exp724.m
% Example 7.2.4

format long
A = [1,4; 2,5; 3,6]
b = [1;1;-2]
E = A'*A
f = A'*b
G = [E f]
rref(G)