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 \(x^2-18\)?
Explanation opens after your attempt
C. \(2\sqrt{65}\)
Concept
\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\). So \(x^2-18=2\sqrt{65}\).
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 \(x^2-18=2\sqrt{65}\).
Exam Tip
\(x^2=13+5+2\sqrt{65}=18+2\sqrt{65}\) है। इसलिए \(x^2-18=2\sqrt{65}\) है।
Login to save your score, XP, coins and progress.
