यदि \(w=\sqrt{18}+\sqrt{13}\) है तो \(w^2-31\) का मान क्या है?
If \(w=\sqrt{18}+\sqrt{13}\), what is the value of \(w^2-31\)?
Explanation opens after your attempt
B. \(2\sqrt{234}\)
Concept
\(w^2=18+13+2\sqrt{234}=31+2\sqrt{234}\). So \(w^2-31=2\sqrt{234}\).
Why this answer is correct
The correct answer is B. \(2\sqrt{234}\). \(w^2=18+13+2\sqrt{234}=31+2\sqrt{234}\). So \(w^2-31=2\sqrt{234}\).
Exam Tip
\(w^2=18+13+2\sqrt{234}=31+2\sqrt{234}\) है। इसलिए \(w^2-31=2\sqrt{234}\) है।
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