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A function f: ℝ → ℝ is defined by f(x) = a(x − 2)² + b, where a > 0. If its range is [5, ∞), which of the following pairs (a, b) is possible?

Answer and explanation

Correct answer: (a, b) = (3, 5)

Because a > 0, the squared term is nonnegative and the parabola opens upward. Its minimum occurs at x = 2, where f(2) = b, so its range is [b, ∞). For this range to be [5, ∞), b must equal 5; any positive a is then possible. Option A has a = 3 and b = 5.

Related tags

Quadratic FunctionsRange Of FunctionsParametersReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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