IGCSE Maths / Functions and function notation
Inverse functions revision notes
Edexcel International GCSE Maths (4MA1), chapter 24: Functions and function notation, specification point 3.2d. Part of the full course.
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An inverse function is a rule that undoes another function. You find it by reversing the steps in the opposite order, or by rearranging the function rule to make x the subject.