Full solution: In 120, use either Gaussian elimination or GaussJordan elimination to
Chapter 8, Problem 18(choose chapter or problem)
If \(\mathbf{A}=\left(\begin{array}{rr} 1 & 4 \\ 5 & 10 \\ 8 & 12 \end{array}\right) \text { and } \mathbf{B}=\left(\begin{array}{rrr} -4 & 6 & -3 \\ 1 & -3 & 2 \end{array}\right)\).
find (a) AB, (b) BA.
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