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If \(f(x)=x+6\) and \(g(x)=x-6\), what is the value of the sum function \((f+g)(x)\)?

Answer and explanation

Correct answer: \(2x\)

By definition of the sum of two functions, \((f+g)(x)=f(x)+g(x)\). Thus, \((x+6)+(x-6)=2x\), since \(+6\) and \(-6\) cancel each other. Option B would arise from multiplying the functions, not adding them. In an exam, first write the definition of the function operation and then simplify.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-OperationsLinear-FunctionsSimplificationAlgebra Of Real FunctionsRelations And FunctionsMathematics

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