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Which of the following represents \(x\le 0\) in interval notation?

Answer and explanation

Correct answer: \(( -\infty,0]\)

\(x\le 0\) includes every number less than 0 as well as 0 itself. Hence, the interval extends leftward up to 0, with a square bracket at 0: \(( -\infty,0]\). A parenthesis is always used with \(-\infty\), since infinity is not a real number. Option D excludes 0, so it represents \(x<0\). Exam tip: For \(\le\) or \(\ge\), include the boundary value using a square bracket.

Related tags

Linear InequalitiesInterval NotationNumber LineInequality SymbolsReal NumbersRepresentation On Number LineMathematicsClass 11 Mcq

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