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What is the domain of f(x) = sqrt((x + 3)/(2 − x))?

Answer and explanation

Correct answer: [−3, 2)

The radicand of a real square root must satisfy (x + 3)/(2 − x) ≥ 0, and x = 2 must be excluded because it makes the denominator zero. The critical points are −3, where the numerator is zero, and 2, where the denominator is zero. A sign chart shows the quotient is negative for x < −3, non-negative on [−3, 2), and negative for x > 2. The point −3 is included because the quotient equals zero and its square root exists. The point 2 is excluded because the original fraction is undefined. Therefore the domain is [−3, 2), which is option A. Option D wrongly excludes −3, option B includes the forbidden denominator value 2, and option C selects intervals where the radicand is negative.

Related tags

DomainRadicalRational-InequalityReal-Valued-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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