Opposite number

In mathematics, the opposite or inverse of a number ${\displaystyle k}$ is an additive or a subtractive number ${\displaystyle n}$ which, when added to ${\displaystyle k}$, results in 0. The opposite of ${\displaystyle a}$ is ${\displaystyle -a}$.^[1][2] For example, −7 is the opposite of 7, because ${\displaystyle 7+-7=0}$.

1. ↑ Weisstein, Eric W. "Additive Inverse". mathworld.wolfram.com. Retrieved 2020-08-27.
2. ↑ "Additive Inverse". www.learnalberta.ca. Retrieved 2020-08-27.