यदि \(x=\sqrt{5}+2\) है तो \(x+\frac{1}{x}\) का मान क्या है?

If \(x=\sqrt{5}+2\), what is the value of \(x+\frac{1}{x}\)?

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

A. \(2\sqrt{5}\)

Step 1

Concept

\( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \). Hence \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\).

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{5}\). \( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \). Hence \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\).

Step 3

Exam Tip

\( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \) है। इसलिए \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\)।

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Mathematics Answer, Explanation and Revision Hints

यदि \(x=\sqrt{5}+2\) है तो \(x+\frac{1}{x}\) का मान क्या है? / If \(x=\sqrt{5}+2\), what is the value of \(x+\frac{1}{x}\)?

Correct Answer: A. \(2\sqrt{5}\). Explanation: \( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \) है। इसलिए \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\)। / \( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \). Hence \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\).

Which concept should I revise for this Mathematics MCQ?

\( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \). Hence \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\).

What exam hint can help solve this Mathematics question?

\( \frac{1}{\sqrt{5}+2}=\sqrt{5}-2 \) है। इसलिए \(x+\frac{1}{x}=\sqrt{5}+2+\sqrt{5}-2=2\sqrt{5}\)।