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What is the domain of (f(x)=\frac{1}{x-5}+2)?

Answer and explanation

Correct answer: (\mathbb{R}\setminus{5})

The direct answer is option A: ℝ\{5}. A domain includes all real inputs that make the formula meaningful. In f(x)=1/(x−5)+2, the only possible problem is division by zero. The denominator is x−5, so set x−5=0; this gives x=5. Therefore every real number except 5 is allowed, and the domain is ℝ\{5}. Option A is correct. Option B, ℝ\{2}, is wrong because 2 is added after the fraction and does not make the denominator zero; at x=2 the expression is defined. Option C, (5,∞), wrongly removes all values less than 5, even though they work; for example, x=4 gives 1/(-1)+2=1. It also does not include 5, but it is still incomplete. Option D, [2,∞), is wrong for the same reason and includes x=5, where division by zero occurs. The added constant 2 changes output values, not the allowed inputs. Remember: for rational expressions, inspect the denominator only and exclude its zeros.

Related tags

Real-Valued-FunctionsDomainRational-Function

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