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What is the domain of f(x)=1/√(x²-4)?

Answer and explanation

Correct answer: (-∞,-2)∪(2,∞)

Because the square root appears in the denominator, its radicand must be strictly positive, not merely non-negative. Thus x²-4>0. Factoring gives (x-2)(x+2)>0, which holds when both factors are positive or both are negative: x>2 or x<-2. Therefore the domain is (-∞,-2)∪(2,∞), option A. The endpoints -2 and 2 are excluded because x²-4 becomes zero there, making the denominator zero. Option B incorrectly includes those endpoints, option C contains values for which the radicand is negative, and D removes only the zero points without excluding the interval where the square root is non-real.

Related tags

Real-Valued-FunctionsDomainDenominator-RadicalReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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