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What is the range of y = 1/(x^2 + 4)?

Answer and explanation

Correct answer: (0, 1/4]

For every real number x, x^2 is non-negative, so x^2 + 4 is at least 4. Since the denominator is always positive, taking reciprocals gives 0 < 1/(x^2 + 4) ≤ 1/4. The upper endpoint is actually attained: when x = 0, y = 1/4. The lower endpoint 0 is not attained because the numerator remains 1 for every real x, although the function approaches 0 as |x| becomes arbitrarily large. Therefore the range is (0, 1/4], making option A correct. Option B incorrectly includes 0, option C lists possible denominator values, and option D ignores the bounds imposed by x^2 ≥ 0.

Related tags

Rational-FunctionsRangeInequalitiesReal-Valued-FunctionsRelations And FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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