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What is the domain of (f(x)=\frac{1}{\sqrt{x+1}}+\sqrt{4-x})?

Answer and explanation

Correct answer: ((-1,4])

A real-valued function can use a square root only when its radicand is non-negative. However, a square root in a denominator must also be nonzero, because division by zero is not defined. Thus the first term requires \(x+1>0\), not merely \(x+1\ge0\). The second term requires \(4-x\ge0\). These conditions must hold together.

Solving the first inequality gives \(x>-1\), while the second gives \(x\le4\). Their intersection is \(-1<x\le4\), written as \((-1,4]\). The value \(-1\) is excluded because it makes the denominator zero, whereas \(4\) is included because the second square root is then zero and the first term remains defined. Therefore option A is correct.

Related tags

DomainMixed-RadicalsIntersection

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