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On a number line, there is a filled point at \(-2\) and a hollow point at \(4\). The shaded region lies to the left of \(-2\) and to the right of \(4\). Which union of intervals does it represent?

Answer and explanation

Correct answer: \(( -\infty,-2]\cup(4,\infty)\)

A filled point includes \(-2\), so a square bracket is used at \(-2\). A hollow point excludes \(4\), so a parenthesis is used at \(4\). Since the shading is in the two outer rays, the solution is \(( -\infty,-2]\cup(4,\infty)\). Option C reverses the inclusion status of \(-2\) and \(4\). Exam tip: a filled point means included, while a hollow point means excluded.

Related tags

Linear InequalitiesNumber LineInterval NotationUnion Of IntervalsEndpoint InclusionRepresentation On Number LineMathematicsClass 11 Mcq

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