यदि \(x=\sqrt{21}+\sqrt{8}\) है तो \(x^2-29\) का मान क्या है?
If \(x=\sqrt{21}+\sqrt{8}\), what is the value of \(x^2-29\)?
Explanation opens after your attempt
C. \(2\sqrt{168}\)
Concept
\(x^2=21+8+2\sqrt{168}=29+2\sqrt{168}\). So \(x^2-29=2\sqrt{168}\).
Why this answer is correct
The correct answer is C. \(2\sqrt{168}\). \(x^2=21+8+2\sqrt{168}=29+2\sqrt{168}\). So \(x^2-29=2\sqrt{168}\).
Exam Tip
\(x^2=21+8+2\sqrt{168}=29+2\sqrt{168}\) है। इसलिए \(x^2-29=2\sqrt{168}\) है।
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