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If a > b > 0 and c < 0, which relation between ac and bc is correct?

Answer and explanation

Correct answer: ac < bc

The governing rule is that multiplying both sides of an inequality by a negative number reverses the inequality sign. From a > b and c < 0, multiply both sides by c. Because c is negative, the direction changes, giving ac < bc. The condition a > b > 0 confirms that a and b are positive, but the reversal specifically depends on c being negative. Equality is impossible: if ac = bc, then c(a − b) = 0; since c is nonzero and a − b is positive, this cannot happen. Option B forgets the sign reversal. Option D is also wrong because the exact relation is strict, not merely non-strict. Hence option A is correct.

Related tags

Linear-InequalitiesNegative-MultiplicationSign-ReversalComparisonIntroduction To InequalitiesLinear InequalitiesMathematicsClass 11 Mcq

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