The function $f:x\mapsto\dfrac{m}{x}+n$ . State the domain of $f(x)$ .

Model answer

x is real, x not equal to 0

Also accepted: x!=0, all real x except 0

Explanation: Since

\tfrac{m}x

is undefined at

x=0

, the domain is

x\in\mathbb{R}, x\ne0

Derived from ZIMSEC Pure Mathematics Paper 2, November 2025, Q5

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