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What is the domain of the function \(f(x)=\log_{3}(x^2-9)\)?

Answer and explanation

Correct answer: \( (-\infty,-3)\cup(3,\infty) \)

The argument of a logarithm must be strictly positive, so \(x^2-9>0\). Factoring gives \((x-3)(x+3)>0\), which holds for \(x<-3\) or \(x>3\). Thus the domain is \((-\infty,-3)\cup(3,\infty)\); the endpoints are excluded because the logarithm’s argument is zero there.

Related tags

Real-Valued-FunctionsDomainLogarithmsQuadratic-InequalityReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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