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The additive inverse of a number is the opposite of that number, that is, the additive inverse of a number x is -x. The sum of a number and its additive inverse is always zero, that is, x + (-x) = 0. Related Terms: addition, number, opposites, sum, zero. English | Espaol.
The additive inverse of 7 is -7 because 7+-7 = 0. The additive inverse of -4 is 4 because -4+4 = 0. The additive inverse of 8 is -8 because you simply change it from positive to negative. The additive inverse of -1 is 1 because you simply change it from negative to positive. In simpler words, the additive inverse of n is -n. The additive inverse of -n is n.