Expert Mathematics Polynomials Class 10 Level 27

यदि \(\alpha+\beta=10\) और \(\alpha\beta=21\), तो कौन सा संयुग्मी अपरिमेय युग्म संभव है?

If \(\alpha+\beta=10\) and \(\alpha\beta=21\), which conjugate irrational pair is possible?

Explanation opens after your attempt
Correct Answer

B. \(5+\sqrt{5}\) और \(5-\sqrt{5}\)\(5+\sqrt{5}\) and \(5-\sqrt{5}\)

Step 1

Concept

The pair \(5+\sqrt{5}\) and \(5-\sqrt{5}\) has sum (10) and product (20) so it also fails. The pair (5+2) and (5-2) would be rational so none of the given options fits.

Step 2

Why this answer is correct

The correct answer is B. \(5+\sqrt{5}\) और \(5-\sqrt{5}\) / \(5+\sqrt{5}\) and \(5-\sqrt{5}\). The pair \(5+\sqrt{5}\) and \(5-\sqrt{5}\) has sum (10) and product (20) so it also fails. The pair (5+2) and (5-2) would be rational so none of the given options fits.

Step 3

Exam Tip

\(5+\sqrt{5}\) और \(5-\sqrt{5}\) का योग (10) और गुणनफल (25-5=20) है इसलिए यह भी नहीं है। सही युग्म (5+2) और (5-2) परिमेय होगा इसलिए दिए विकल्पों में कोई नहीं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(\alpha+\beta=10\) और \(\alpha\beta=21\), तो कौन सा संयुग्मी अपरिमेय युग्म संभव है? / If \(\alpha+\beta=10\) and \(\alpha\beta=21\), which conjugate irrational pair is possible?

Correct Answer: B. \(5+\sqrt{5}\) और \(5-\sqrt{5}\) / \(5+\sqrt{5}\) and \(5-\sqrt{5}\). Explanation: \(5+\sqrt{5}\) और \(5-\sqrt{5}\) का योग (10) और गुणनफल (25-5=20) है इसलिए यह भी नहीं है। सही युग्म (5+2) और (5-2) परिमेय होगा इसलिए दिए विकल्पों में कोई नहीं। / The pair \(5+\sqrt{5}\) and \(5-\sqrt{5}\) has sum (10) and product (20) so it also fails. The pair (5+2) and (5-2) would be rational so none of the given options fits.

Which concept should I revise for this Mathematics MCQ?

The pair \(5+\sqrt{5}\) and \(5-\sqrt{5}\) has sum (10) and product (20) so it also fails. The pair (5+2) and (5-2) would be rational so none of the given options fits.

What exam hint can help solve this Mathematics question?

\(5+\sqrt{5}\) और \(5-\sqrt{5}\) का योग (10) और गुणनफल (25-5=20) है इसलिए यह भी नहीं है। सही युग्म (5+2) और (5-2) परिमेय होगा इसलिए दिए विकल्पों में कोई नहीं।

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