What is the **domain** of $f(x) = \dfrac{1}{x}$?
A$\mathbb{R}$
B$\mathbb{R}^{+}$
C$\{0\}$
D$\mathbb{R} \setminus \{0\}$
Answer & Solution
Correct answer: D. $\mathbb{R} \setminus \{0\}$
Division by zero is undefined, so $x = 0$ is excluded. Domain is all real numbers except $0$.
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