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

Answer and explanation

Correct answer: \(x^2\)

Function addition is performed pointwise: \((f+g)(x)=f(x)+g(x)=(x^2+2x)+(x^2-2x)=2x^2\). Therefore, \(\left(\frac{f+g}{2}\right)(x)=\frac{2x^2}{2}=x^2\), so option A is correct. Options C and D are simply \(f\) and \(g\), respectively, while option B omits the squared term. Exam tip: when adding symmetric expressions, first check which opposite terms cancel.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-OperationsPointwise-AdditionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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