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Additive inverse of x is -x (minus x). It's the number that when you add it to the original number, the sum is 0 (zero). 0 is the ADDITIVE IDENTITY, since x+0 = x for all x.

Multiplicative inverse of x is 1/x. Its the number that when you multiply it by the original number, the product is 1. 1 is the MULTIPLICATIVE IDENTITY since 1x = x for all x.

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Given a function, f, its inverse is the function which restores the result to the original value.For example,

the inverse of f(x) = x + 3 is g(x) = x - 3

the inverse of f(x) = 2x is g(x) = x/2

Another way to look at it is the composite functions f(g(x)) and g(f(x)) must be the identity function.

f(g(x)) = g(f(x)) = x


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Q: What is definition of inverse?
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