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What is the range of f(x) = sqrt((x - 2)^2 + 7)?

Answer and explanation

Correct answer: [√7, ∞)

The governing idea is that a square is always non-negative. Thus (x - 2)^2 ≥ 0 for every real x, so (x - 2)^2 + 7 ≥ 7. Taking the non-negative square root gives f(x) ≥ √7. Equality is actually attained when x - 2 = 0, that is, at x = 2; hence √7 must be included in the range. As x moves away from 2, the square term can become arbitrarily large, so the function values increase without bound. Consequently the range is [√7, ∞). Option B incorrectly uses 7 instead of its square root, option C wrongly excludes the attainable minimum, and option D ignores the lower bound. Therefore option A is correct.

Related tags

RangeRadical-FunctionsMinimum-ValueReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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