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If x is a real number and x ∉ [-4,2), which interval is correct on the number line?

Answer and explanation

Correct answer: (-∞,-4) ∪ [2,∞)

The governing concept is the complement of an interval in the set of real numbers. In [-4,2), the point -4 is included because of the closed bracket, while 2 is excluded because of the open parenthesis. The complement must contain all real numbers outside this interval. Numbers less than -4 are included, but -4 itself is not, giving (-∞,-4). Numbers greater than or equal to 2 are included, because 2 was excluded from the original interval, giving [2,∞). Therefore the complement is (-∞,-4) ∪ [2,∞), so option B is correct. Option A reverses both endpoint memberships, C gives the original interval, and D wrongly excludes 2.

Related tags

Linear-InequalitiesComplementInterval-NotationReal-NumbersRepresentation On Number LineLinear InequalitiesMathematicsClass 11 Mcq

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