The additive inverse of an integer is a number, when added to the integer, equals 0. Basically, its the opposite number.
Example : Find the additive inverse of 5
5 + ? = 0 .... the additive inverse would be -5...because 5 + (-5) = 5 - 5 = 0.
The additive inverse of 3 = -3
additive inverse of - 4 = 4
additive inverse of 6 = -6
