The absolute value of x is equal to -x, then x is a negative number or 0.

The absolute value refers to the distance from the corresponding point of a number on the number axis to the origin, which is called the absolute value of the number. The absolute value is represented by "||". |b-a| or |a-b| represents the distance between the point representing a and the point representing b on the number axis.

The absolute value of a positive number is itself. The absolute value of a negative number is its opposite. The absolute value of 0 is still 0. The special absolute value of zero is both itself and its opposite, written |0|=0.

The absolute value of any rational number is non-negative, that is to say, the absolute value of any rational number is ≥0.

The absolute value of any pure imaginary number is the absolute value of the imaginary part (for example: |2i|=2; |-ei|=e).

The absolute value of 0 is still 0.