यदि \(x=\sqrt{7}+\sqrt{2}\) है, तो \(x^2-9\) का मान क्या है?

If \(x=\sqrt{7}+\sqrt{2}\), what is the value of \(x^2-9\)?

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

A. \(2\sqrt{14}\)

Step 1

Concept

\(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\). Therefore \(x^2-9=2\sqrt{14}\).

Step 2

Why this answer is correct

The correct answer is A. \(2\sqrt{14}\). \(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\). Therefore \(x^2-9=2\sqrt{14}\).

Step 3

Exam Tip

\(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\) है। इसलिए \(x^2-9=2\sqrt{14}\) है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(x=\sqrt{7}+\sqrt{2}\) है, तो \(x^2-9\) का मान क्या है? / If \(x=\sqrt{7}+\sqrt{2}\), what is the value of \(x^2-9\)?

Correct Answer: A. \(2\sqrt{14}\). Explanation: \(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\) है। इसलिए \(x^2-9=2\sqrt{14}\) है। / \(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\). Therefore \(x^2-9=2\sqrt{14}\).

Which concept should I revise for this Mathematics MCQ?

\(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\). Therefore \(x^2-9=2\sqrt{14}\).

What exam hint can help solve this Mathematics question?

\(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\) है। इसलिए \(x^2-9=2\sqrt{14}\) है।