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If (x\in[2,7)), in which interval will (x-2) lie?

Answer and explanation

Correct answer: ([0,5))

The direct answer is A: \([0,5)\). The interval \(x\in[2,7)\) means \(2\le x<7\). Subtract 2 from every part: \(2-2\le x-2<7-2\), so \(0\le x-2<5\). Therefore the answer is \([0,5)\). The left endpoint is closed because \(x=2\) is allowed, and then \(x-2=0\). The right endpoint is open because \(x=7\) is not allowed, so 5 cannot be included. Option A has exactly these endpoints. Option B, \((0,5]\), wrongly excludes 0 and includes 5. Option C, \([0,5]\), wrongly includes 5. Option D, \((0,5)\), wrongly excludes both valid endpoint 0 and the rest of the correct boundary information. A translation of an interval changes its numerical endpoints but does not change an open bracket into a closed bracket. Memory cue: subtract the same number from both ends, then copy the bracket types.

Related tags

Linear-InequalitiesInterval-TransformationTranslation

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