यदि \(x=\sqrt{13}+\sqrt{5}\) है तो \(x^2-18\) का मान क्या है?

If \(x=\sqrt{13}+\sqrt{5}\), what is the value of \(x^2-18\)?

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

C. \(2\sqrt{65}\)

Step 1

Concept

\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\). So \(x^2-18=2\sqrt{65}\).

Step 2

Why this answer is correct

The correct answer is C. \(2\sqrt{65}\). \(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\). So \(x^2-18=2\sqrt{65}\).

Step 3

Exam Tip

\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\) है। इसलिए \(x^2-18=2\sqrt{65}\) है।

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Mathematics Answer, Explanation and Revision Hints

यदि \(x=\sqrt{13}+\sqrt{5}\) है तो \(x^2-18\) का मान क्या है? / If \(x=\sqrt{13}+\sqrt{5}\), what is the value of \(x^2-18\)?

Correct Answer: C. \(2\sqrt{65}\). Explanation: \(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\) है। इसलिए \(x^2-18=2\sqrt{65}\) है। / \(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\). So \(x^2-18=2\sqrt{65}\).

Which concept should I revise for this Mathematics MCQ?

\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\). So \(x^2-18=2\sqrt{65}\).

What exam hint can help solve this Mathematics question?

\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\) है। इसलिए \(x^2-18=2\sqrt{65}\) है।