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What is the range of f(x) = √(x² + 2x + 2)?

Answer and explanation

Correct answer: [1, ∞)

Rewrite the expression inside the radical by completing the square: x² + 2x + 2 = (x + 1)² + 1. Since (x + 1)² ≥ 0, the radicand is at least 1. Its minimum value 1 occurs at x = −1, so the function has minimum √1 = 1. As |x| increases, (x + 1)² becomes arbitrarily large, and the square root also grows without bound. Hence every value from 1 upward is attained, giving the range [1, ∞). Option B overlooks the positive minimum inside the radical, option C incorrectly adds 1 instead of taking its square root, and option D includes negative values even though a principal square root is always non-negative. The endpoint 1 is included because it occurs at x = −1.

Related tags

Relations-FunctionsReal-Valued-FunctionsRangeRadical-QuadraticReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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