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What is the real domain of the function \(f(x)=x-7\)?

Answer and explanation

Correct answer: \(\mathbb{R}\)

\(f(x)=x-7\) is a linear polynomial function. It has neither a denominator that could become zero nor a square root or logarithm that imposes a restriction. Hence, \(f(x)\) is defined for every real \(x\), so its domain is \(\mathbb{R}\). Option C is incorrect because \(f(7)=0\); there is no reason to exclude 7. Exam tip: Every polynomial function has real domain \(\mathbb{R}\).

Related tags

Real Valued FunctionsDomainLinear FunctionPolynomial FunctionRelations And FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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