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If f(x) = 2√x, what is its real domain?

Answer and explanation

Correct answer: [0, ∞)

The governing concept is the real-domain restriction for an even square root. For √x to be a real number, its radicand must satisfy x ≥ 0. Multiplying the square root by 2 changes output values but does not introduce any additional restriction on x. Therefore every x in [0, ∞) is allowed, including x = 0, where f(0) = 0. Negative inputs are excluded because the square root of a negative real number is not real. Option B is too narrow because it omits the valid endpoint 0. Option C incorrectly permits negative inputs, while option D contains non-positive values even though only 0 from that set is allowed. Thus the real domain is [0, ∞).

Related tags

DomainSquare RootReal-Valued FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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