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What is the real domain of the function f(x) = √((x − 1)/(x + 2))?

Answer and explanation

Correct answer: (−∞, −2) ∪ [1, ∞)

The radicand must be non-negative, and x + 2 cannot be zero. The critical values are −2 and 1. A sign check of (x − 1)/(x + 2) gives non-negative values for x < −2 and x ≥ 1. Exclude −2 because the denominator is zero; include 1 because the radicand is zero there.

Related tags

DomainSign-AnalysisRadical-FunctionsAlgebra Of Complex NumbersComplex Numbers And Quadratic EquationsMathematicsClass 11 Mcq

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