यदि \(x=\sqrt{2}+\sqrt{7}\), तो \(x^2-9\) का मान क्या है?
If \(x=\sqrt{2}+\sqrt{7}\), what is the value of \(x^2-9\)?
Explanation opens after your attempt
A. \(2\sqrt{14}\)
Concept
\(x^2=2+7+2\sqrt{14}=9+2\sqrt{14}\).
Why this answer is correct
Therefore \(x^2-9=2\sqrt{14}\), which is irrational.
Exam Tip
Square first, then subtract the rational part. चरण 1: \(x^2=2+7+2\sqrt{14}=9+2\sqrt{14}\)। चरण 2: इसलिए \(x^2-9=2\sqrt{14}\), जो अपरिमेय है। चरण 3: पहले वर्ग करें, फिर परिमेय भाग घटाएँ।
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