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What is the simplified form of x ∈ [-8,-2] ∪ (-2,5) on the number line?

Answer and explanation

Correct answer: [-8,5)

The governing concept is the union of intervals: it contains every number belonging to at least one of the given intervals. The first interval includes all numbers from -8 through -2, including both endpoints. The second interval contains numbers strictly greater than -2 and less than 5, so -2 is excluded there but is already included by the first interval. Thus there is no gap at -2. The left endpoint -8 remains included, while 5 remains excluded because the second interval has an open right endpoint. Therefore the union is [-8,5), which is option A. Options B and D incorrectly exclude -8, while option C incorrectly includes 5.

Related tags

Linear-InequalitiesUnionInterval-NotationNumber-LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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