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You must understand the meaning and structure of function notation. Functions can be defined and described in various ways.
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Glossary

function

A rule that connects one value in one set with one and only one value in another set.

union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AP Calculus AB (USA)2Algebra and FunctionsFunctions-
AP Calculus BC (USA)2Algebra and FunctionsFunctions-
AQA A-Level (UK - Pre-2017)C3Algebra and FunctionsFunctions-
AQA A2 Maths 2017Pure MathsFunctions and TransformationsFunctions and Mappings-
AQA AS/A2 Maths 2017Pure MathsFunctions and TransformationsFunctions and Mappings-
CBSE XII (India)Relations and FunctionsRelations & FunctionsTypes of relations, reflexive, symmetric, transitive and equivalence-
CBSE XI (India)Sets and FunctionsRelations & FunctionsElementary functions: exp, log sign, polynomial, rational-
CCEA A-Level (NI)C4Algebra and FunctionsFunctions-
CIE A-Level (UK)P1Algebra and FunctionsFunctions-
Edexcel A-Level (UK - Pre-2017)C3Algebra and FunctionsFunctions-
Edexcel A2 Maths 2017Pure MathsFunctions and GraphsFunctions and Mappings-
Edexcel AS/A2 Maths 2017Pure MathsFunctions and GraphsFunctions and Mappings-
I.B. Higher Level2Algebra and FunctionsFunctions-
I.B. Standard Level2Algebra and FunctionsFunctions-
Methods (UK)M2Algebra and FunctionsFunctions-
I.B. (MSSL)4Algebra and FunctionsFunctions-
OCR A-Level (UK - Pre-2017)C3Algebra and FunctionsFunctions-
OCR A2 Maths 2017Pure MathsFunctions and TransformationsFunctions and Mappings-
OCR MEI A2 Maths 2017Pure MathsFunctions and TransformationsFunctions and Mappings-
OCR-MEI A-Level (UK - Pre-2017)C3Algebra and FunctionsFunctions-
Pre-U A-Level (UK)1Algebra and FunctionsFunctions-
Scottish Advanced HighersM1Algebra and FunctionsFunctions-
Scottish (Highers + Advanced)HM1Algebra and FunctionsFunctions-
Scottish HighersM1Algebra and FunctionsFunctions-
Universal (all site questions)AAlgebra and FunctionsFunctions-
WJEC A-Level (Wales)C3Algebra and FunctionsFunctions-