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

Answer and explanation

Correct answer: Constant function

(g − f)(x) = (x² + 1) − (x² − 1) = 2. Its value remains 2 for every real value of x, so it is a constant function. The x² terms cancel because they are identical in both functions; therefore, the result is not quadratic. In exams, take care to change the signs of every term when subtracting the second function.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsConstant-FunctionFunction-SubtractionAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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