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What is the domain of f(x)=√((x+5)/(9-x))?

Answer and explanation

Correct answer: [-5,9)

The expression under the square root must be at least zero, and the denominator must not vanish. Hence we solve (x+5)/(9−x)≥0 with x≠9. The critical numbers are −5, where the numerator is zero, and 9, where the denominator is zero. On x<−5, the numerator is negative and denominator positive, giving a negative quotient. On −5<x<9, both numerator and denominator are positive, giving a non-negative quotient. For x>9, the numerator is positive but denominator negative, again giving a negative quotient. The value −5 is included because the radicand is zero there; 9 is excluded because division by zero is undefined. Thus the domain is [−5,9), option A. C incorrectly includes 9, B reverses the valid interval, and D ignores the square-root condition.

Related tags

Real-Valued-FunctionsDomainSign-AnalysisReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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