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Which interval represents (|x-3|<8) on the number line?

Answer and explanation

Correct answer: ((-5,11))

The direct answer is B: \((-5,11)\). The rule \(|u|<8\) is equivalent to \(-8<u<8\). Put u=x-3: \(-8<x-3<8\). Add 3 to all three parts, giving \(-5<x<11\). The endpoints are open because equality is not allowed: x=-5 gives absolute value 8, and x=11 also gives absolute value 8. Option A, \([-5,11]\), incorrectly includes both endpoints. Option B correctly shows the open interval between them. Option C shows the two outside rays, which would describe values with distance greater than 8. Option D shows outside rays including endpoints, which would describe distance at least 8. The correct idea is that a strict absolute-value inequality gives the inside region. Memory cue: less than means inside and open; greater than means outside.

Related tags

Linear InequalitiesAbsolute ValueNumber Line

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