Domain

The domain of a function is the complete set of all input values (objects) that can be substituted into the function. For $f(x)=\sqrt{x}$ the domain is $x\ge 0$, because negative numbers have no real square root.

Choosing a valid domain keeps every output well defined.

You meet Domain 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 Domain means but use it fluently in a full solution.

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

Other key terms from the Functions chapter you may want to check:

• Function
• Codomain
• Range
• Object and Image
• Composite Function
• Inverse Function