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What is the domain of (f(x)=\frac{1}{|x|-3})?

Answer and explanation

Correct answer: (\mathbb{R}\setminus{-3,3})

The direct answer is A, \\(\\mathbb{R}\\setminus\\{-3,3\\}\\). A rational function is defined only when its denominator is nonzero. Here the denominator is \\(|x|-3\\), so require \\(|x|-3\\ne0\\), or \\(|x|\\ne3\\). The equation \\(|x|=3\\) has two solutions, x=3 and x=-3. Remove both from all real numbers. Option A is correct. Option B removes only 3 and wrongly keeps -3, where the denominator is zero. Option C removes only -3 and wrongly keeps 3. Option D keeps only numbers between -3 and 3, although many outside values, such as 4 or -5, are perfectly allowed. The absolute-value equation always requires both signs.

Related tags

DomainAbsolute-ValueRational

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