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What is the domain of f(x) = sqrt((x - 1)/(x + 3))?

Answer and explanation

Correct answer: (-∞, -3) ∪ [1, ∞)

The radicand of a real square root must be non-negative, and the denominator inside the fraction must not be zero. Thus we require (x - 1)/(x + 3) ≥ 0 with x ≠ -3. The critical points are -3, where the fraction is undefined, and 1, where the numerator is zero. A sign check on the intervals shows the quotient is positive for x < -3, negative for -3 < x < 1, and non-negative for x ≥ 1. The point 1 is included because the radicand is zero, while -3 is excluded. Therefore the domain is (-∞, -3) ∪ [1, ∞), option A. The other options either select the negative interval or mishandle the critical endpoints.

Related tags

DomainRadical-InequalitySign-ChartReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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