Negative Number - Negation

Negation

The negative version of a positive number is referred to as its negation. For example, −3 is the negation of the positive number 3. The sum of a number and its negation is equal to zero:

3 + −3  =  0.

That is, the negation of a positive number is the additive inverse of the number.

Using algebra, we may write this principle as an algebraic identity:

x + −x  =  0.

This identity holds for any positive number x. It can be made to hold for all real numbers by extending the definition of negation to include zero and negative numbers. Specifically:

  • The negation of 0 is 0, and
  • The negation of a negative number is the corresponding positive number.

For example, the negation of −3 is +3. In general,

−(−x)  =  x.

The absolute value of a number is the non-negative number with the same magnitude. For example, the absolute value of −3 and the absolute value of 3 are both equal to 3, and the absolute value of 0 is 0.

Read more about this topic:  Negative Number

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