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What is the domain of the function (f(x)=\frac{1}{\sqrt{x-2}})?

Answer and explanation

Correct answer: (x>2)

The direct answer is option A: the domain is x>2, or (2,∞). For a square root to be real, its radicand must be at least zero. Here x−2≥0 would be needed for the root itself, but the root is in the denominator, and a denominator cannot equal zero. Therefore we need √(x−2)>0, which is equivalent to x−2>0. Adding 2 gives x>2. Option A is correct. Option B, x≥2, incorrectly includes x=2; at x=2 the denominator is √0=0, so division is undefined. Option C, x<2, makes x−2 negative, so the square root is not real. Option D, x≠2, is too broad because values such as x=1 also make the radicand negative. Thus both restrictions matter: the radicand must be nonnegative and the denominator must be nonzero. Memory cue: a square root in a denominator requires a strictly positive radicand.

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DomainRangeRadicalFunction

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