Chapter 5.4, Problem 22E

Find the least-squares solution $\stackrel{\to }{x}*$ of the system
$A\stackrel{\to }{x}=\stackrel{\to }{b}$ , where $A=\left[\begin{array}{cc}3& 2\\ 5& 3\\ 4& 5\end{array}\right]$ and $\stackrel{\to }{b}=\left[\begin{array}{l}5\\ 9\\ 2\end{array}\right]$
Determine the error $\Vert \stackrel{\to }{b}-A\stackrel{\to }{x}*\Vert$ .