Use the QR factorization found in Example 3 to solve A x = b _{1} \text { and } A x = b _{2}, where
b _{1}=\left[\begin{array}{l}1 \\8 \\8\end{array}\right] \quad \text { and } \quad b _{2}=\left[\begin{array}{c}10 \\-4 \\10\end{array}\right].
Use the QR factorization found in Example 3 to solve A x = b _{1} \text { and } A x = b _{2}, where
b _{1}=\left[\begin{array}{l}1 \\8 \\8\end{array}\right] \quad \text { and } \quad b _{2}=\left[\begin{array}{c}10 \\-4 \\10\end{array}\right].