GCSE; AQA; Algebraic formulae - AQA Function notation – Higher. Formulae are used in everyday life, from working out areas and volumes of shapes to converting units of measurement.

Learn about function notation, how to find an inverse function by changing the subject, ... GCSE exam-style questions. 𝑓(𝑥) = 𝑥 – 7 and 𝑔(𝑥) = 3𝑥 + 1; Find 𝑔𝑓(5).