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If \(f(x)=\frac{x}{x+2}\) and \(g(x)=\frac{3}{x-5}\), what is the domain of the product function \((fg)(x)=f(x)g(x)\)?

Answer and explanation

Correct answer: \(\mathbb{R}\setminus\{-2,5\}\)

The product is \((fg)(x)=\frac{3x}{(x+2)(x-5)}\), so both denominator factors must be non-zero. Thus, \(x\neq -2\) and \(x\neq 5\), giving the domain \(\mathbb{R}\setminus\{-2,5\}\). Excluding only \(-2\) or only \(5\) is incomplete. Exam tip: the domain of a product function is the intersection of the domains of the two functions.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsProduct-Of-FunctionsDomain-Of-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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