Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

A student claims that if the square of an integer is divisible by 2, then the integer itself is divisible by 2. How is this statement useful in proving the irrationality of \(\sqrt{2}\)?

Answer and explanation

Correct answer: It shows that both numerator and denominator in a supposed lowest-form fraction for \(\sqrt{2}\) are even.

Assume \(\sqrt{2}=p/q\) with coprime integers \(p,q\). Then \(p^2=2q^2\), so \(p^2\), and hence \(p\), is even. Putting \(p=2k\) makes \(q\) even too, contradicting coprimality. Exam tip: always begin the contradiction proof with the fraction in lowest terms.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 2DivisibilityProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.