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Which is the correct number-line representation of |x| ≥ 4?

Answer and explanation

Correct answer: (−∞, −4] ∪ [4, ∞)

The governing concept is the distance meaning of absolute value together with a union of two intervals. The inequality |x| ≥ 4 says that x is at least 4 units from zero. Hence x ≤ −4 or x ≥ 4. The word “or” requires a union: (−∞, −4] ∪ [4, ∞). The endpoints −4 and 4 are included because the sign is ≥, so square brackets are required at both finite endpoints. Therefore, option C is correct. Option A is the central interval and represents distance at most 4; option B excludes the endpoints and represents distance less than 4; option D incorrectly omits the separate right-side condition and includes values between −4 and 4.

Related tags

Absolute ValueUnionNumber LineRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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