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What is the domain of f(x) = √((x + 5)/(2 - x))?

Answer and explanation

Correct answer: [-5, 2)

The radicand must satisfy (x + 5)/(2 − x) ≥ 0, and the denominator requires x ≠ 2. The critical values are x = −5, where the numerator is zero, and x = 2, where the expression is undefined. On x < −5, the numerator is negative and denominator positive, so the quotient is negative. On −5 < x < 2, both are positive, so the quotient is positive. For x > 2, the numerator is positive but denominator negative, giving a negative quotient. The value x = −5 is allowed because it produces a zero radicand; x = 2 is excluded. Hence the domain is [-5, 2), which is option A. B reverses the sign intervals, C includes an undefined point, and D excludes a valid endpoint.

Related tags

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

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