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If f(x) = 3/(x² − 2x + 2) + 1, what is the range of f?

Answer and explanation

Correct answer: (1, 4]

Complete the square in the denominator: x² − 2x + 2 = (x − 1)² + 1. Therefore the denominator is at least 1 and is always positive. Let d = (x − 1)² + 1, so d ≥ 1. Then 3/d lies in (0, 3], because it equals 3 when d = 1, which occurs at x = 1, and it approaches 0 as |x| becomes large but never equals 0. Adding 1 shifts every value upward by 1, giving the range (1, 4]. The upper endpoint 4 is included at x = 1, while the lower endpoint 1 is excluded because the positive fraction can never be zero. Hence option A is correct. Option B incorrectly includes 1, C omits values between 1 and 4, and D includes impossible negative outputs.

Related tags

Relations And FunctionsRangeCompleting The SquareRational FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematicsClass 11 Mcq

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