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How will the interval ((2,7]) be written as an inequality?

Answer and explanation

Correct answer: (2<x\leq 7)

Interval notation uses different brackets to show whether an endpoint is included. A round bracket means the endpoint is excluded, while a square bracket means the endpoint is included. Therefore the notation \((2,7]\) describes all real numbers greater than 2 and less than or equal to 7.

The left round bracket at 2 means \(x=2\) is not allowed, so the relation must be \(2<x\). The right square bracket at 7 means \(x=7\) is allowed, so the second relation is \(x\le7\). Combining them gives \(2<x\le7\), which is option A. Including 2 or excluding 7 would change the given interval.

Related tags

Linear InequalitiesIntroductionClass 11

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