Pearson Edexcel International GCSE in Mathematics (Specification A) · 4MA1 · Free · no account needed

Functions

Function notation, composite functions and inverses — the machine picture that makes them all one idea. Higher Tier.

Every lesson here ends the same way: learn it, teach it to an AI pupil who asks the awkward question, then defend it against the thinker with the strongest claim on it — free · no account needed.

1 module of Pearson Edexcel International GCSE Mathematics (all Higher Tier), each explained in full — what it is, why it works, when a question is asking for it, the mistakes that cost marks and worked examples — with five graded questions marked on your own device. Completely free.

The module in Functions

Function Notation, Composite & Inverse (Higher Tier)

f(x) as a machine: feeding it values, chaining two machines together, and running a machine backwards. Higher Tier. f(x) = 3x − 2 names a machine: feed in x, get out 3x − 2.

When a question is asking for it: Whenever notation like f(4), fg(2), f⁻¹(x) appears. Learn Function Notation, Composite & Inverse →

The mistakes that cost marks in Functions

One from each module — the error examiners see most, with the module that puts it right.

Where Functions sits in the specification

Content area 3 of 4MA1, sub-topic 3.2. Incandio is aligned to the specification and is not published by Pearson; the numbers are given so you can check every module against your own copy.

How Functions is mastered on Incandio

Every module above ends the same way: five questions that climb Grade 6 → 9+, then you teach the method back to Ember, an AI pupil who asks the awkward question, and defend it against the mathematician with the strongest claim on it. Exam Ready carries 11 authored exam-style questions across this strand, marked on Incandio.

All of Incandio Mathematics · The 4MA1 specification · Exam Ready