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If the real-valued functions \(f(x)=x^2-2x\) and \(g(x)=2x-x^2\) are given, what is the value of \((f+g)(x)\)?

Answer and explanation

Correct answer: \(0\)

The sum of two functions is defined pointwise: \((f+g)(x)=f(x)+g(x)\). Therefore, \((f+g)(x)=(x^2-2x)+(2x-x^2)=x^2-x^2-2x+2x=0\). Hence, option A is correct. Option B results from not handling the opposite signs correctly. Exam tip: combine like powers only after preserving the signs of all terms.

Related tags

Relations-And-FunctionsAlgebra-Of-Real-FunctionsFunction-AdditionLike-TermsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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