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If \(f(x)=x+1\) and \(g(x)=x+3\), what is \((fg)(1)\)?

Answer and explanation

Correct answer: 8

Here \((fg)(x)\) denotes the product of the two functions, i.e. \((fg)(x)=f(x)\cdot g(x)\). So \(f(1)=1+1=2\) and \(g(1)=1+3=4\). Therefore \((fg)(1)=2\times4=8\). The closest distractor is 6, which arises if someone mistakenly adds the values (\(2+4=6\)) instead of multiplying. Exam tip: remember \((fg)\) means multiply the functions, while \(f\circ g\) denotes composition.

Related tags

Product Of FunctionsFunction OperationEvaluationIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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