यदि \(r=\sqrt{21}+\sqrt{5}\) और \(s=\sqrt{21}-\sqrt{5}\) हैं, तो (rs) का मान क्या है?

If \(r=\sqrt{21}+\sqrt{5}\) and \(s=\sqrt{21}-\sqrt{5}\), what is the value of (rs)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

A. (16)

Step 1

Concept

This is conjugate multiplication. Therefore (rs=21-5=16).

Step 2

Why this answer is correct

The correct answer is A. (16). This is conjugate multiplication. Therefore (rs=21-5=16).

Step 3

Exam Tip

यह संयुग्मी गुणन है। इसलिए (rs=21-5=16) होगा।

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Mathematics Answer, Explanation and Revision Hints

यदि \(r=\sqrt{21}+\sqrt{5}\) और \(s=\sqrt{21}-\sqrt{5}\) हैं, तो (rs) का मान क्या है? / If \(r=\sqrt{21}+\sqrt{5}\) and \(s=\sqrt{21}-\sqrt{5}\), what is the value of (rs)?

Correct Answer: A. (16). Explanation: यह संयुग्मी गुणन है। इसलिए (rs=21-5=16) होगा। / This is conjugate multiplication. Therefore (rs=21-5=16).

Which concept should I revise for this Mathematics MCQ?

This is conjugate multiplication. Therefore (rs=21-5=16).

What exam hint can help solve this Mathematics question?

यह संयुग्मी गुणन है। इसलिए (rs=21-5=16) होगा।