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What is the range of f(x) = (2x + 1)/3 when x ∈ ℝ?

Answer and explanation

Correct answer: ℝ

The function f(x) = (2x + 1)/3 is a non-constant linear function with non-zero slope 2/3. A non-constant linear function defined for every real x can produce every real output. Algebraically, let y = (2x + 1)/3. Then 3y = 2x + 1, so x = (3y − 1)/2. For every real y, this formula gives a real x, proving that every real number occurs as an output. Thus the range is ℝ, so option B is correct. Options A and D incorrectly impose one-sided bounds, while option C claims the function has only one output, which is impossible for a linear function with non-zero slope.

Related tags

RangeLinear FunctionsReal NumbersReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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