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If (f:\mathbb{R}\to\mathbb{R}) is given by (f(x)=\frac{1}{|2x-1|-5}), what should be the correct domain?

Answer and explanation

Correct answer: (\mathbb{R}-{-2,3})

The direct answer is A: the correct domain is \(\mathbb{R}\setminus\{-2,3\}\). A rational expression is defined only when its denominator is non-zero. Here the denominator is |2x−1|−5, so require |2x−1|−5≠0, or |2x−1|≠5. An absolute value equals 5 when 2x−1=5 or 2x−1=−5. These give 2x=6 and x=3, or 2x=−4 and x=−2. Remove both numbers from all real numbers. Option A is correct. Option B is wrong because 5 is not the excluded value; substituting x=5 gives denominator |9|−5=4, which is non-zero. Option C is wrong because x=1/2 gives denominator |0|−5=−5, also non-zero. Option D is wrong because many numbers greater than or equal to 3 are valid, such as x=4. Memory cue: for a fraction, set only the denominator equal to zero and exclude every resulting x.

Related tags

DomainModulusRational Function

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