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If f(x) = 1/√(16 − x²), what is the domain?

Answer and explanation

Correct answer: (-4, 4)

For a real-valued expression, the radicand 16 − x² must be non-negative. However, the square root is in the denominator, so it cannot be zero; the required condition is therefore 16 − x² > 0. Solving gives x² < 16, or equivalently −4 < x < 4. Thus both endpoints are excluded: at x = 4 or x = −4 the denominator becomes zero, and division by zero is undefined. Every number strictly between −4 and 4 makes the denominator positive and the function real and defined. Hence option A, (−4, 4), is correct. Option B incorrectly includes the zero-denominator endpoints, while C describes the outside region and D excludes only the endpoints but includes values where the radicand is negative.

Related tags

Relations-FunctionsDomain-RangeRadical-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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