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What is the domain of f(x) = 1/(x² + 1)?

Answer and explanation

Correct answer: R, अर्थात सभी वास्तविक संख्याएँ

The governing concept is that the domain of a real-valued rational function contains every real input for which its denominator is non-zero. Here the denominator is x² + 1. Since x² is always at least 0 for every real x, x² + 1 is always at least 1. Therefore it can never equal zero, so no real number must be excluded from the domain. Hence the domain is R, the set of all real numbers, and option A is correct. Options B and C incorrectly exclude 1 or −1, even though their denominators are 2. Option D includes only positive numbers, although zero and negative numbers are also valid inputs.

Related tags

Real-Valued-FunctionsDomainRational-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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