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If \(f(x)=\frac{1}{x^2+1}\) and \(g(x)=x^2+1\), what is the range of the product function \((fg)(x)\)?

Answer and explanation

Correct answer: \(\{1\}\)

The product is \((fg)(x)=f(x)g(x)=\frac{1}{x^2+1}(x^2+1)=1\). Since \(x^2+1\) is never zero, the product is defined for every real \(x\), but its value is always 1. Hence, its range is only \(\{1\}\). Exam tip: simplify the product first and check whether it becomes a constant function.

Related tags

Relations-FunctionsAlgebra-Of-FunctionsRangeProduct-Of-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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