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If f(x)=x²+1, what is the value of (f+f)(x)?

Answer and explanation

Correct answer: 2x²+2

By the definition of the sum of functions, (f+f)(x)=f(x)+f(x)=2f(x). Therefore, (f+f)(x)=2(x²+1)=2x²+2, so option A is correct. Option B incorrectly doubles only the constant term instead of the entire function. Exam tip: the sum of a function with itself is twice the function.

Related tags

Relations And FunctionsAlgebra Of FunctionsSum Of FunctionsReal FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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