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Which interval represents (x\ge -1)?

Answer and explanation

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

The direct answer is option B, \\([-1,\\infty)\\). The inequality \\(x\\ge-1\\) means x is -1 or any number greater than -1. In interval notation, a square bracket at -1 shows that -1 is included, and infinity always uses a parenthesis because infinity is not an actual number that can be reached. Therefore the interval is \\([-1,\\infty)\\). Option B is correct. Option A, \\(( -\\infty,-1]\\), describes numbers less than or equal to -1, so it reverses the direction. Option C, \\((-1,\\infty)\\), excludes -1, but the symbol \\(\\ge\\) includes it. Option D, \\((-\\infty,-1)\\), describes numbers strictly less than -1 and excludes the endpoint. Check the endpoint first: equality means a square bracket; “greater than” means the interval extends right.

Related tags

Linear-InequalitiesInterval-NotationEndpoint

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