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Which inequality has the solution interval (−∞, 2]?

Answer and explanation

Correct answer: x ≤ 2

The governing concept is translating interval notation into inequality notation. The interval (−∞, 2] contains every real number less than 2 and also contains 2 itself. The square bracket at 2 is the key: it means the endpoint is included. Therefore the corresponding inequality is x ≤ 2, which is option B. The symbol −∞ is always written with a parenthesis because infinity is not an actual number that can be included as an endpoint. Option A describes the interval (−∞, 2), excluding 2, while option C describes numbers greater than 2 and option D includes 2 but extends to the right. Thus only B represents the stated interval exactly.

Related tags

Linear-InequalitiesInterval-NotationNumber-LineEndpointRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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