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If f(x) = x² and g(x) = −x² + 4 are real-valued functions, what type of function is (f + g)(x)?

Answer and explanation

Correct answer: constant function, 4

For the sum of two functions, (f + g)(x) = f(x) + g(x) = x² + (−x² + 4) = 4. The like terms x² and −x² cancel, so the result is 4 for every x, making it a constant function. The quadratic option is incorrect because the x² term vanishes. Exam tip: combine the coefficients of like powers before identifying the function type.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-SumConstant-FunctionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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