Chapter 8.1, Problem 20PE

To determine

To calculate: The missing numbers in the matrices $\left[\begin{array}{cccc}1& -2& 3& 4\\ 2& 1& -4& 3\\ -3& 4& -1& -2\end{array}\right]\to \left[\begin{array}{cccc}1& -2& 3& 4\\ 0& 5& \boxed{}& \boxed{}\\ 0& -2& \boxed{}& \boxed{}\end{array}\right]\to \left[\begin{array}{cccc}1& -2& 3& 4\\ 0& 1& \boxed{}& \boxed{}\\ 0& -2& \boxed{}& \boxed{}\end{array}\right]$.