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What is the domain of (f(x)=\sqrt{\frac{x^2-4}{9-x^2}})?

Answer and explanation

Correct answer: ((-3,-2]\cup[2,3))

The direct answer is A: \\( (-3,-2]\cup[2,3) \\). A square root requires the fraction to be non-negative, and the denominator cannot be zero. Thus \\( (x^2-4)/(9-x^2)\ge0\\), with x not equal to ±3. Factor: \\(x^2-4=(x-2)(x+2)\\) and \\(9-x^2=(3-x)(3+x)\\). The critical points are -3,-2,2,3. Testing intervals gives positive values on \\((-3,-2]\\) and \\([2,3)\\); the zeros -2 and 2 are included, while -3 and 3 are excluded because the denominator is zero. A is correct. B includes values between -2 and 2, where the fraction is negative. C uses outside intervals, where the fraction is negative. D includes forbidden points and also intervals with negative radicand. Exam cue: include numerator zeros, exclude denominator zeros, then use a sign chart.

Related tags

Relations-FunctionsDomainRadical-Rational

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