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What is the domain of (f(x)=\frac{1}{\sqrt{16-x^2}})?

Answer and explanation

Correct answer: ((-4,4))

The direct answer is A, \\((-4,4)\\). A real square root requires its radicand to be nonnegative, but here the square root is in the denominator, so the radicand must actually be positive: \\(16-x^2>0\\). This gives \\(x^2<16\\), hence \\(-4<x<4\\). The endpoints cannot be included because at x=4 or x=-4 the denominator becomes zero, and division by zero is undefined. Option A is correct. Option B includes the endpoints, so it incorrectly allows denominator zero. Option C describes values outside the interval, where \\(16-x^2<0\\) and the square root is not real. Option D excludes only the endpoints but includes outside values, which also fail the real-square-root condition. Exam cue: a square root in a denominator needs a strictly positive radicand.

Related tags

Real-Valued-FunctionsDomainRadical-Denominator

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