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Which statement is false for ( -2< x \leq 4 )?

Answer and explanation

Correct answer: (x=-2) is possible

The direct answer is B: x=−2 is possible. The condition −2<x≤4 has two parts: x must be strictly greater than −2, and x may be equal to 4. Thus −2 is excluded, while 4 is included. A is true because 4≤4. B is false because −2 is not greater than −2; equality is forbidden by the strict < sign. C is true because −2<0≤4. D is true because −2<3.5≤4. On a number line, place an open circle at −2 and a closed circle at 4, shading only the interval between them. The open endpoint represents exclusion, and the closed endpoint represents inclusion. Therefore the statement asking whether x=−2 is possible is the false one. A common mistake is to treat < and ≤ alike; the small extra line in ≤ includes the endpoint. Memory cue: open circle means not included, closed circle means included.

Related tags

Interval EndpointFalse StatementConcept

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