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Which of the following statements is correct about representing a solution set on a number line using interval notation?

Answer and explanation

Correct answer: Infinity is never a member of a solution set; therefore, an interval extending to infinity always uses a parenthesis at infinity

\(\infty\) and \(-\infty\) are not real numbers, so they cannot be included as members of an interval. Hence, intervals such as \((3,\infty)\) and \(( -\infty, 3]\) always use a parenthesis at infinity. A square bracket is used only when a real endpoint is included, so options A and B are incorrect. Exam tip: whenever infinity appears in interval notation, use a parenthesis next to it.

Related tags

Linear InequalitiesInterval NotationNumber LineOpen EndpointInfinitySet RepresentationRepresentation On Number LineMathematics

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