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What is the domain of f(x) = √((4 - x)/(x + 2))?

Answer and explanation

Correct answer: (-2, 4]

For the function to be real, the radicand (4 − x)/(x + 2) must be at least zero, and x = −2 must be excluded because it makes the denominator zero. The critical numbers are −2, where the expression is undefined, and 4, where the numerator is zero. Testing intervals: for x < −2, the numerator is positive and denominator negative, so the quotient is negative; for −2 < x < 4, both numerator and denominator are positive, so the quotient is positive; for x > 4, the numerator is negative and denominator positive, so it is negative. At x = 4 the quotient is zero and is allowed. Therefore the domain is (-2, 4], so option A is correct.

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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