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Which is the correct representation of |x + 6| > 3 on the number line?

Answer and explanation

Correct answer: (−∞, −9) ∪ (−3, ∞)

The expression |x + 6| represents the distance of x from −6. Requiring this distance to be greater than 3 means that x must lie more than 3 units to the left or right of −6. Algebraically, |x + 6| > 3 becomes x + 6 > 3 or x + 6 < −3. Therefore x > −3 or x < −9. Since the sign is strict, neither boundary −9 nor −3 is included, so both endpoints are open. The number-line solution is consequently the union of the two exterior intervals (−∞, −9) ∪ (−3, ∞). Option A gives the interior interval and reverses the region, option B includes boundaries, and option D also incorrectly uses closed endpoints. Thus option C is the only correct representation.

Related tags

Linear InequalitiesAbsolute ValueNumber LineRepresentation On Number LineMathematicsClass 11 Mcq

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