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What is the domain of f(x) = 1/(x² + 6x + 10)?

Answer and explanation

Correct answer: ℝ

For this rational function, the only possible restriction is that the denominator must not be zero. Complete the square: x² + 6x + 10 = (x + 3)² + 1. Since (x + 3)² is always at least 0, the denominator is always at least 1, so it can never equal zero for any real x. Consequently, every real number is permitted and the domain is ℝ; option A is correct. Equivalently, the discriminant of the denominator is 6² − 4(1)(10) = 36 − 40 = −4, confirming that it has no real zeros. Options B and C incorrectly remove individual values, while option D incorrectly excludes x = −3 even though the denominator there is 1, not 0. The governing concept is checking denominator zeros before stating a rational function’s domain.

Related tags

Domain Of FunctionsQuadratic ExpressionsComplete SquareReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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