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Which is the correct representation of |x − 7| > 2 on the number line?

Answer and explanation

Correct answer: (−∞, 5) ∪ (9, ∞)

The modulus |x − 7| measures the distance of x from 7. The inequality |x − 7| > 2 therefore means that x is more than 2 units away from 7. Splitting the absolute-value inequality gives x − 7 > 2 or x − 7 < −2. These simplify to x > 9 or x < 5. Because the inequality is strict, the boundary values 5 and 9 are excluded; this is why both endpoints are represented by open circles. On the number line, the solution consists of the two outer rays, extending left from 5 and right from 9: (−∞, 5) ∪ (9, ∞). Option A represents the inside interval and option B includes the boundary, so both are wrong. Option D incorrectly includes 5 and 9. Thus option C is correct.

Related tags

Linear InequalitiesAbsolute ValueNumber LineRepresentation On Number LineMathematicsClass 11 Mcq

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