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If \(f(x)=x^2-1\) and \(g(x)=x^2+1\), what is the range of \((g-f)(x)\)?

Answer and explanation

Correct answer: \(\{2\}\)

\((g-f)(x)=g(x)-f(x)=(x^2+1)-(x^2-1)=2\) for every real \(x\). Thus, the difference is a constant function, whose range is the singleton set \(\{2\}\). \(\{0\}\) is incorrect because the constant terms give \(1-(-1)=2\). Exam tip: simplify \((g-f)(x)\) completely before determining its range.

Related tags

Relations And FunctionsAlgebra Of FunctionsRangeConstant FunctionReal FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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