Inverse Function

An inverse function $f^{-1}$ reverses a function, sending each image back to its original object, so $f^{-1}(f(x))=x$. Only one-to-one functions have inverses.

To find $f^{-1}(x)$, let $y=f(x)$, make $x$ the subject, then swap the letters.

You meet Inverse 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 Inverse Function 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: Inverse Function (EN) · Fungsi Songsang (BM) · 反函数 (中文)

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

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