Full answer: In 120, use either Gaussian elimination or GaussJordan elimination to solve
Chapter 8, Problem 16(choose chapter or problem)
If \(\mathbf{A}=\left(\begin{array}{rr} -2 & 0 \\ 4 & 1 \\ 7 & 3 \end{array}\right) \text { and } \mathbf{B}=\left(\begin{array}{rr} 3 & -1 \\ 0 & 2 \\ -4 & -2 \end{array}\right)\), find (a) A - B, (b) B - A, (c) 2(A + B).
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