Algebra Archive: Questions from July 16, 2022
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If possible, find \( A+B, A-B, 5 A \), and \( 5 A-2 B \). (If not possible, \[ A=\left[\begin{array}{ll} -1 & 1 \\ -1 & 2 \end{array}\right], \quad B=\left[\begin{array}{rr} -1 & 1 \\ 2 & 7 \end{array3 answers -
If possible, find \( A B, B A \), and \( A^{2} \). (If not possible, enter IMPOSSIBLE.) \[ A=\left[\begin{array}{ll} 1 & 4 \\ 3 & 4 \end{array}\right], B=\left[\begin{array}{rr} 3 & -1 \\ -1 & 6 \end{1 answer -
If possible, find \( A B, B A \), and \( A^{2} \). (If not possible, enter IMPOSSIBLE.) \[ A=\left[\begin{array}{rr} 7 & 3 \\ -4 & -5 \end{array}\right], \quad B=\left[\begin{array}{rr} -2 & 0 \\ 2 &1 answer -
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