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Which statement correctly means x∈[1,4]?

Answer and explanation

Correct answer: 1≤x≤4

The governing concept is interval notation. Square brackets indicate that the corresponding endpoint is included in the set. Thus [1,4] contains every real number from 1 through 4, including both 1 and 4. In inequality form this is 1≤x≤4, so option A is correct. Option B represents the open interval (1,4), excluding both endpoints. Option C includes 1 but excludes 4, corresponding to [1,4). Option D excludes 1 but includes 4, corresponding to (1,4]. A number-line check gives closed dots at both 1 and 4, which confirms the two “less than or equal to” signs. Therefore A precisely translates the given interval.

Related tags

Interval-NotationNumber-LineInequality-FormGraphical Solution Of Linear Inequalities In Two VariablesLinear InequalitiesMathematicsClass 11 Mcq

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