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)

Introduction

—coming soon—

Practice and continue

Practice

Inverse functions

Finding f⁻¹(x) by rearranging y = f(x), and how the inverse undoes it.

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Composite functions

Applying one function to the output of another, and why fg(x) applies g first.