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Which values satisfy 1/x > 0, when x ≠ 0?

Answer and explanation

Correct answer: x > 0

The governing sign rule is that a reciprocal has the same sign as its nonzero denominator because the numerator 1 is positive. If x>0, then 1/x>0. If x<0, then dividing the positive number 1 by a negative number gives a negative result, so the inequality fails. The value x=0 is excluded because division by zero is undefined. Therefore the complete solution is x>0, and option A is correct. For instance, x=2 gives 1/2>0, whereas x=−2 gives −1/2<0. Option B has the wrong sign, option C incorrectly includes negative values, and D is false because every positive real x is a valid solution.

Related tags

Rational InequalitySign AnalysisReciprocalIntroduction To InequalitiesLinear InequalitiesMathematicsClass 11 Mcq

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