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* If "a" is positive, "-a" is negative.* If "a" is negative, "-a" is positive.

* If "a" is zero, "-a" is zero.

If you want to force a negative number, you can write -|a|, i.e., the negative of the absolute value.

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9y ago
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9y ago

The expression -a does not always represent a negative number because could be negative changing the negative sign in front to a positive sign.

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Q: Why does the expression -a does not always represent a negative number?
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