Chapter 6.5, Problem 14E

Let A = $\left[\begin{array}{cc}2& 1\\ -3& -4\\ 3& 2\end{array}\right]$, b = $\left[\begin{array}{c}5\\ 4\\ 4\end{array}\right]$, u = $\left[\begin{array}{c}4\\ -5\end{array}\right]$, and v = $\left[\begin{array}{c}6\\ -5\end{array}\right]$. Compute Au and Av. and compare them with b. Is it possible that at least one of u or v could be a least-squares solution of Ax = b? (Answer this without computing a least-squares solution.)