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

Answer and explanation

Correct answer: 2

(f−g)(x)=f(x)−g(x)=(x²+1)−(x²−1)=x²+1−x²+1=2. Thus, the difference is the constant function 2 for every x. Option D results from mishandling the signs while subtracting g(x). Exam tip: when subtracting a function, change the sign of every term in the function being subtracted.

Related tags

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

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