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If f(x)=x²+1 and g(x)=x²−3, what type of function is (f−g)(x)?

Answer and explanation

Correct answer: Constant function, 4

The governing concept is pointwise subtraction of functions: (f−g)(x)=f(x)−g(x). Substitute the given expressions carefully, keeping the minus sign before the second bracket: (f−g)(x)=(x²+1)−(x²−3)=x²+1−x²+3=4. The x² terms cancel exactly, so the output does not depend on x. A function whose value remains 4 for every input in its domain is a constant function. Thus option A is correct. It is not the zero function, because the resulting value is 4 rather than 0. It is not 4x, since no x-term remains after subtraction. It is also not quadratic, because the x² terms cancel completely. The classification follows from the simplified expression, not from the original appearance of the two functions.

Related tags

Relations-And-FunctionsFunction-OperationsDifference-Of-FunctionsConstant-FunctionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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