In mathematics, the additive inverse, or opposite, of a number n is the number that, when added to n, yields zero. The additive inverse of n is denoted ?n. For example, the additive inverse of 7 is ?7, because 7 + (?7) 0, and the additive inverse of ?0.3 is 0.3, because ?0.3 + 0.3 0. Additive inverse of 14 is -14. Additive inverse of (-21) is 21.
