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Question Medium Mathematics Chapter 1: Real Numbers 6: Proof of irrationality of √2, √3, √5 Class 10 Level 17

यदि \(\sqrt{5}=\frac{p}{q}\) सरलतम रूप में माना जाए और \(p^2=5q^2\) मिले, तो (p) को किस रूप में लिखना उचित है?

If \(\sqrt{5}=\frac{p}{q}\) is assumed in lowest form and \(p^2=5q^2\) is obtained, in which form should (p) be written?

Explanation opens after your attempt
Correct Answer

C. (p=5k)

Step 1

Concept

From \(p^2=5q^2\), \(p^2\) is divisible by (5).

Step 2

Why this answer is correct

Since (5) is prime, (p) is divisible by (5).

Step 3

Exam Tip

After divisibility, write (p=5k), where (k) is an integer. चरण 1: \(p^2=5q^2\) से \(p^2\) (5) से विभाज्य है। चरण 2: (5) अभाज्य है, इसलिए (p) (5) से विभाज्य है। चरण 3: विभाज्यता मिलने पर (p=5k) लिखें, जहां (k) पूर्णांक है।

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