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Which statement is equivalent to x ∈ (−∞, 4)?

Answer and explanation

Correct answer: x < 4

Interval notation must be read using its endpoint symbols. The interval (−∞, 4) contains every real number less than 4. The parenthesis at 4 means that 4 itself is not included; infinity is never treated as an included endpoint either. Therefore the equivalent inequality is x < 4, so option B is correct. Option A incorrectly includes 4, which belongs to the interval [−∞ conceptually not used, 4] only in a different notation; more simply, substituting x = 4 shows it fails the open-end condition. Options C and D describe values at or above 4 and point in the opposite direction. The original question’s option assignment was corrected because x ≤ 4 is not equivalent to the stated open interval.

Related tags

Interval-NotationLinear-InequalitiesNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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