2024 September(H11) Math Question 10
Number Types & Properties
- matrices
To find A−BA - BA−B, subtract corresponding entries:
A−B=[−263−8]−[851−4]A - B = \begin{bmatrix} -2 & 6 \\ 3 & -8 \end{bmatrix} - \begin{bmatrix} 8 & 5 \\ 1 & -4 \end{bmatrix}A−B=[−236−8]−[815−4]
=[−2−86−53−1−8−(−4)]= \begin{bmatrix} -2 - 8 & 6 - 5 \\ 3 - 1 & -8 - (-4) \end{bmatrix}=[−2−83−16−5−8−(−4)]
=[−1012−4]= \begin{bmatrix} -10 & 1 \\ 2 & -4 \end{bmatrix}=[−1021−4]
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