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Which is the domain of (f(x)=\frac{1}{\sqrt{x^2-9}})?

Answer and explanation

Correct answer: ( (-\infty,-3)\cup(3,\infty) )

The expression is 1 divided by a square root, so two conditions are required. First, x²−9 must be nonnegative for the square root to be real. Second, because the square root is in the denominator, it must not equal zero. Together these conditions require x²−9>0. Factoring gives (x−3)(x+3)>0, which holds outside the interval from −3 to 3.

Therefore x<−3 or x>3, and the domain is (−∞,−3)∪(3,∞), so option A is correct. The endpoints −3 and 3 are excluded because the denominator would be zero there. Option B incorrectly includes them, while option D excludes only the endpoints and still includes values between them, where the square root is not real.

Related tags

Relations-FunctionsDomain-RangeHardLevel-32

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