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If \(f(x)=x^3-2x\) and \(g(x)=x^3+2x\), which function is \(\frac{f+g}{2}\)?

Answer and explanation

Correct answer: \(x^3\)

Adding the functions gives \((f+g)(x)=(x^3-2x)+(x^3+2x)=2x^3\). Therefore, \(\frac{f+g}{2}=\frac{2x^3}{2}=x^3\), so option A is correct. Option C is only \(g(x)\), not the average of the two functions. In an exam, combine like terms first and then divide the entire result by 2.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-AdditionAverage-Of-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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