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Which option is the correct interval form of x < −1 or x ≥ 4?

Answer and explanation

Correct answer: (−∞, −1) ∪ [4, ∞)

The word “or” means that either inequality may be satisfied, so the solution set is the union of two separate intervals. For x < −1, the endpoint −1 is excluded because the inequality is strict, giving (−∞, −1). Infinity is always written with a parenthesis because it is not a real endpoint. For x ≥ 4, the endpoint 4 is included, giving [4, ∞). Combining them produces (−∞, −1) ∪ [4, ∞), option A. Option B incorrectly includes −1 and excludes 4. Options C and D describe values between the two boundary points rather than values outside them. Thus A correctly represents both the logical connector and endpoint inclusion.

Related tags

Interval NotationUnionCompound InequalitiesNumber LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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