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Which operation always changes inequality a>b into ac>bc?

Answer and explanation

Correct answer: c>0

The governing property is preservation of order under multiplication. If a>b and c is positive, multiplying both sides by c keeps the direction unchanged, so ac>bc. For example, if a=5, b=3, and c=2, then 10>6 remains true. If c is negative, multiplication reverses the order and produces ac<bc, not the expression shown. If c=0, both products become equal to zero, so strict inequality is lost. Merely stating c≠0 is insufficient because c could be negative and would reverse the sign. Therefore the condition that always gives ac>bc is c>0, represented by option A.

Related tags

Properties-Of-InequalityMultiplicationOrder-PreservationIntroduction To InequalitiesLinear InequalitiesMathematicsClass 11 Mcq

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