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What is the result of (−∞, 4) ∩ [−3, 8] on the number line?

Answer and explanation

Correct answer: [−3, 4)

The intersection contains numbers that belong to both intervals simultaneously. The interval (−∞, 4) contains every number less than 4, but it excludes 4 because the endpoint is open. The interval [−3, 8] contains all numbers from −3 to 8, including −3 and 8. The common portion therefore starts at −3 and continues up to, but not including, 4. The left endpoint is closed because −3 is included in the second interval and is certainly less than 4. The right endpoint is open because 4 is excluded from the first interval. Consequently, the intersection is [−3, 4), which is option B. The other options either use an incorrect endpoint symbol or include numbers not common to both intervals.

Related tags

Linear InequalitiesInterval IntersectionNumber LineInterval NotationClass 11 MathematicsRepresentation On Number LineMathematicsClass 11 Mcq

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