Full answer: In 120, use either Gaussian elimination or GaussJordan elimination to solve
Chapter 8, Problem 17(choose chapter or problem)
If \(\mathbf{A}=\left(\begin{array}{rr} 2 & -3 \\ -5 & 4 \end{array}\right) \text { and } \mathbf{B}=\left(\begin{array}{rr} -1 & 6 \\ 3 & 2 \end{array}\right)\), find (a) AB, (b) BA, (c) \(A^2=AA\), (d) \(B^2=BB\).
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