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

Answer and explanation

Correct answer: (4, ∞)

The domain of a sum is the intersection of the domains of its functions. In f(x), the square root is in the denominator, so x − 4 must be strictly positive: x > 4. Since g is defined for all real numbers, the domain of (f + g)(x) is (4, ∞).

Related tags

Relations And FunctionsDomain Of FunctionsSum Of FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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