In most math, "-0" is considered the same as "+0", and is thus just 0. The concept of a "signed" 0 (one that can be positive or negative) comes up sometimes in computing, where so-called "floating point" arithmetic requires both positive and negative zero. For more on this, see the Wikipedia article linked below.
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X does not exist.
The answer does not exist because of complicated calculus. It is technically infinite or undefined because 0 - (negative) is the minor limit that is never reached.
A probability must needs be a number between 0 and 1 (often expressed as 0% and 100%), inclusive.
Negatove roots are simply the reciprocals of the positive roots. So negative roots will exist if the number that you are taking a root of is not 0 and the positive root exists.
yes