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Function - IB Maths Definition

Reviewed by: Naomi C

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What is a function in IB maths?

In the context of the IB Maths course, a function is a fundamental concept that describes a relationship between two sets of values.

A function is typically written as f open parentheses x close parentheses. Each element in the domain, x, is associated with exactly one element in the range, y. This relationship is often expressed through an equation, such as y equals f open parentheses x close parentheses, where f is the function, x represents the input value, and f open parentheses x close parentheses represents the output.

Functions are used to model real-world situations and solve problems, allowing students to analyse patterns, make predictions, and gain deeper insights into mathematical concepts.

Function revision resources to ace your exams

Save My Exams has a great range of resources to explore the topic of functions in more detail. Try exploring these revision notes on language of functions, composite & inverse functions and graphing functions.

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Need help reaching your target grade? Explore our notes, questions by topic and worked solutions, tailor-made for IB Maths.

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Naomi C

Reviewer: Naomi C

Expertise: Maths Content Creator

Naomi graduated from Durham University in 2007 with a Masters degree in Civil Engineering. She has taught Mathematics in the UK, Malaysia and Switzerland covering GCSE, IGCSE, A-Level and IB. She particularly enjoys applying Mathematics to real life and endeavours to bring creativity to the content she creates.

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