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 \(x^2-9\)?
Explanation opens after your attempt
A. \(2\sqrt{14}\)
Concept
\(x^2=7+2+2\sqrt{14}=9+2\sqrt{14}\). Therefore \(x^2-9=2\sqrt{14}\).
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 \(x^2-9=2\sqrt{14}\).
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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