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If A = {x ∈ R : 2x − 1 ≥ 5}, what is the interval form of A?

Answer and explanation

Correct answer: [3, ∞)

Solve the defining inequality step by step: 2x − 1 ≥ 5. Adding 1 to both sides gives 2x ≥ 6, and dividing by the positive number 2 gives x ≥ 3. Thus A contains 3 and every real number greater than 3. In interval notation, inclusion of 3 is shown by a square bracket, while infinity always uses a parenthesis. Therefore A = [3,∞), so B is correct.

Related tags

SetsLinear InequalitiesInterval NotationReal NumbersIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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