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If \(f(x)=\frac{x}{x+2}\) and \(g(x)=x-1\), which value is excluded from the domain of \((fg)(x)=f(x)g(x)\)?

Answer and explanation

Correct answer: −2

Here, \((fg)(x)=\frac{x}{x+2}(x-1)\). The denominator cannot be zero, so \(x+2=0\) gives \(x=-2\). Therefore, \(-2\) is excluded from the domain. Remember that the domain of a product is the intersection of the domains of the two functions; a zero in the numerator does not by itself exclude a value.

Related tags

Relations-And-FunctionsAlgebra-Of-Real-FunctionsDomain-Of-ProductExcluded-ValuesAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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