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Glossary

Function

A function is a rule that assigns to each input (object) exactly one output (image). We often write it as f(x)f(x), for example f(x)=2x+1f(x)=2x+1.

Every element of the domain must map to a single value, which is what separates a function from a general relation.

Meaning

A function is a rule that assigns to each input (object) exactly one output (image). We often write it as f(x)f(x), for example f(x)=2x+1f(x)=2x+1.

Every element of the domain must map to a single value, which is what separates a function from a general relation.

Where it appears in Add Math

You meet Function in the Functions chapter of SPM Additional Mathematics. Knowing the term precisely matters in the exam: questions often hinge on reading a keyword correctly, and because SPM marking is analytic, using the right definition in your working helps secure method marks.

Our teachers make sure a student can not only recite what Function means but use it fluently in a full solution.

The term in three languages

Because the SPM Add Math paper is bilingual (BM/EN), it helps to know this term in each language: Function (EN) · Fungsi (BM) · 函数 (中文)

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Written by the spmaddmath.com.my editorial team.· Last updated 5 September 2026

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