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What is the domain of (f(x)=\frac{\sqrt{x-2}}{x-7})?

Answer and explanation

Correct answer: ( [2,\infty)\setminus{7} )

The direct answer is option A: the domain is [2,\infty)\setminus\{7\}. A real square root is defined only when its radicand is non-negative, so x-2\ge0, giving x\ge2. Also, a denominator cannot be zero; therefore x-7\ne0, giving x\ne7. Combining both conditions gives [2,\infty) with 7 removed. Option A is correct because it includes 2 and all larger numbers except 7. Option B wrongly removes 2, although \sqrt{0} is defined. Option C includes numbers below 2, where the square root is not real. Option D wrongly excludes every x greater than 7, even though such values are allowed. Memory cue: square root means radicand \ge0; denominator means denominator \ne0.

Related tags

Real-Valued-FunctionsDomainRadicalRational

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