Intro to inverse functions (article) | Khan Academy
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:inverse-functions-intro/a/intro-to-inverse-functions
WEBDefining inverse functions. In general, if a function f takes a to b , then the inverse function, f − 1 , takes b to a . The value a goes into function f and becomes value B which goes into f inverse and becomes value A. From this, we have the formal definition of inverse functions: f ( a) = b f − 1 ( b) = a.
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