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Question
Which equality represents multiplication by the negative scalar \[-1\]?
Options
\[(-1)A=1\cdot A\]
\[(-1)A=A\]
\[(-1)A=O\]
\[(-1)A=-A\]
MCQ
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Solution
A negative scalar of \[-1\] changes the sign of every matrix entry. The resulting matrix is the negative of \[A\], so \[(-1)A=-A\].
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