IGCSE Maths / Functions and function notation
Solving composite and inverse function equations 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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To solve equations involving composite and inverse functions, first work out which function rule applies and in what order. Then solve the resulting equation and check your answer in the original rules.