कौन सा विकल्प \(2+\sqrt{5}\) और \(2-\sqrt{5}\) के गुणनफल का मान है?

Which option is the value of the product of \(2+\sqrt{5}\) and \(2-\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. (-1)

Step 1

Concept

(\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1). In conjugate multiplication the irrational part cancels.

Step 2

Why this answer is correct

The correct answer is A. (-1). (\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1). In conjugate multiplication the irrational part cancels.

Step 3

Exam Tip

(\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1) है। संयुग्मी गुणन में अपरिमेय भाग हट जाता है।

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Mathematics Answer, Explanation and Revision Hints

कौन सा विकल्प \(2+\sqrt{5}\) और \(2-\sqrt{5}\) के गुणनफल का मान है? / Which option is the value of the product of \(2+\sqrt{5}\) and \(2-\sqrt{5}\)?

Correct Answer: A. (-1). Explanation: (\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1) है। संयुग्मी गुणन में अपरिमेय भाग हट जाता है। / (\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1). In conjugate multiplication the irrational part cancels.

Which concept should I revise for this Mathematics MCQ?

(\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1). In conjugate multiplication the irrational part cancels.

What exam hint can help solve this Mathematics question?

(\(2+\sqrt{5}\)\(2-\sqrt{5}\)=4-5=-1) है। संयुग्मी गुणन में अपरिमेय भाग हट जाता है।