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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:

SyllabusModuleSectionTopic
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
B Algebra and FunctionsB8 Further 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