Author note — to cover (Higher)

Higher page. Read f(x) as the output at x; evaluate f(3), f(−2), 2f(1) and f(a) as an expression; solve f(x) = k for linear and quadratic rules. Out of scope: domain and range language, which is A level; inverse and composite functions are the sibling pages. (A7)

Introduction

—coming soon—

Practice and continue

Practice

Function notation

Reading f(x) as the output at x, and evaluating f(3) and 2f(1).

Next lesson

Inverse functions

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