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-2 is the additive inverse of +2
An inverse number is an opposing number of the standard number. For example, if a standard number is 12 then the inverse is -12.
Mathematically, an inverse is an opposite, it is something that reverses what its inverse does, for example, addition and subtraction are inverse functions, as are multiplication and division. The inverse of a fraction is obtained by exchanging numerator and denominator; the inverse of a half is two.
direct
for variables x and y and constanat k -