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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.
Yes, if x is a negative number.
It represents a number.
Multiplying a negative number is always negative. There really is not a comparison for this type of math problem.
Any negative number, and infinity. However, a number (called "i") was created to represent the square roots of negative numbers.