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Which condition is represented by ((-\infty,2)\cup(2,\infty)) on the number line?

Answer and explanation

Correct answer: (x\ne 2)

The direct answer is option B, x≠2. The union (-∞,2)∪(2,∞) contains every real number less than 2 and every real number greater than 2. The number 2 itself is excluded because neither interval includes its endpoint. That is exactly the meaning of x not equal to 2. Option A, x=2, represents only the single point 2, which is the opposite of this interval. Option C, x≤2, includes all numbers below 2 and also includes 2, but it excludes numbers above 2. Option D, x≥2, includes 2 and numbers above it, but excludes numbers below 2. The open-looking gap at 2 is the important clue. Memory cue: two rays extending in both directions with only one point missing mean ‘all real numbers except that point’.

Related tags

Linear InequalitiesNot EqualNumber Line

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