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What is the domain of the function f(x) = ln((x − 2)/(7 − x))?

Answer and explanation

Correct answer: (2, 7)

The argument of the natural logarithm must be positive. The fraction (x − 2)/(7 − x) is positive only when 2 < x < 7, as a sign check at the critical points 2 and 7 shows. The endpoints are excluded because the argument is zero at 2 and undefined at 7.

Related tags

DomainLogarithmsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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