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Which interval correctly represents (x<-1)?

Answer and explanation

Correct answer: ((-\infty,-1))

The inequality \(x<-1\) includes every real number smaller than -1, but it excludes -1 itself because the sign is strictly less than, not less than or equal to. Interval notation expresses this as \((-\infty,-1)\). The parenthesis at -1 shows that the endpoint is not included, and infinity always uses a parenthesis. Therefore option A is correct.

For example, -2 and -10 belong to this interval, while -1 does not. The interval \((-\infty,-1]\) would represent \(x\le-1\), which incorrectly includes -1. Intervals beginning at -1 represent values greater than or equal to -1 and therefore cannot describe the given inequality. Hence option A is the required representation.

Related tags

Linear InequalitiesIntroductionClass 11

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