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Which counterexample shows that \(a<b\) does not always imply \(a^2<b^2\)?

Answer and explanation

Correct answer: \(a=-3,\ b=-1\)

In option A, \(-3<-1\), but squaring gives \((-3)^2=9\) and \((-1)^2=1\), so \(9>1\), not \(9<1\). Hence, it is a counterexample to the stated implication. In options B, C, and D, both numbers are non-negative, so their squares preserve the original order. Exam tip: Check the signs of the numbers before squaring an inequality.

Related tags

Linear InequalitiesCounterexampleSquaring InequalitiesSign AnalysisIntroduction To InequalitiesMathematicsClass 11 Mcq

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