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If (f(x)=\sqrt{x}) and (g(x)=\sqrt{1-x}), what is the domain of ((f+g)(x))?

Answer and explanation

Correct answer: ( [0,1] )

The direct answer is option A: \([0,1]\). A square root is defined over the reals only when its radicand is nonnegative. For \(f(x)=\sqrt{x}\), require \(x\ge0\). For \(g(x)=\sqrt{1-x}\), require \(1-x\ge0\), so \(x\le1\). Both functions must exist because they are being added. The intersection of \(x\ge0\) and \(x\le1\) is \(0\le x\le1\), or \([0,1]\). Option A is correct and includes endpoints because both radicands are allowed to be zero. Option B wrongly excludes 0 and 1. Option C includes values greater than 1, where \(\sqrt{1-x}\) is not real. Option D includes negative values, where \(\sqrt{x}\) is not real. For sums, intersect the individual domains.

Related tags

Relations-FunctionsDomainRadical

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