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A student says that \(\sqrt{3}\) is rational because \(1.7^2=2.89\), which is very close to 3. What is the error in the student's reasoning?

Answer and explanation

Correct answer: 3 के निकट होने वाला वर्ग यह सिद्ध नहीं करता कि उसका वर्गमूल परिमेय है

\(1.7^2=2.89\) is only close to 3, not equal to it. A rational number would need to have square exactly 3. In fact, \(1.7=17/10\), and its square is \(289/100\). Exam tip: never treat an approximation as an exact proof.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof Of IrrationalityMisconception AnalysisProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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