Author note — to cover (Higher)

Higher page, per the A7 braces. Find f⁻¹(x) by writing y = f(x), rearranging for x and swapping letters, for linear rules and simple fractions like f(x) = (x + 2)/3; interpret the inverse as undoing, so f⁻¹(f(x)) = x. Domain restrictions and reflection in y = x are A level. (A7)

• Fluency — direct questions on inverse functions, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).