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If f(x) = √(4 − x) and g(x) = 1/x, what is the domain of (f + g)(x)?

Answer and explanation

Correct answer: (−∞, 4] − {0}

The sum (f + g)(x) is √(4 − x) + 1/x. The square-root condition is 4 − x ≥ 0, which gives x ≤ 4. The reciprocal function requires x ≠ 0 because division by zero is undefined. Both conditions must hold simultaneously, so the domain is (−∞, 4] with 0 removed. Equivalently, it can be written as (−∞, 0) ∪ (0, 4]. Therefore option A is correct. Option B forgets the denominator restriction, option C reverses the square-root inequality, and option D includes values greater than 4 where √(4 − x) is not real. Addition does not cancel either restriction.

Related tags

Relations-FunctionsDomainSum-Of-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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