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What is the domain of (f(x)=\frac{\sqrt{11-x}}{\sqrt{x+1}})?

Answer and explanation

Correct answer: ((-1,11])

Both square roots impose conditions. The numerator \(\sqrt{11-x}\u0005 is real when \(11-x\ge0\u0005, giving \(x\le11\u0005. The denominator \(\sqrt{x+1}\u0005 must be real and nonzero. Thus \(x+1>0\u0005, giving \(x>-1\u0005. These conditions must be satisfied simultaneously.

Combining them gives \(-1<x\le11\u0005, or \((-1,11]\u0005. Therefore option A is correct. The value \(x=-1\u0005 is excluded because the denominator becomes zero. The value \(x=11\u0005 is included because the numerator may equal zero while the denominator remains nonzero.

Related tags

Real-Valued-FunctionsDomainRadical-Quotient

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