यदि \(x=\sqrt{6}+\sqrt{5}\) और \(y=\sqrt{6}-\sqrt{5}\), तो \(x^2-y^2\) क्या है?
If \(x=\sqrt{6}+\sqrt{5}\) and \(y=\sqrt{6}-\sqrt{5}\), what is \(x^2-y^2\)?
Explanation opens after your attempt
Correct Answer
A. \(4\sqrt{30}\)
Concept
(x-2-y-2=(x-y)(x+y)=\(2\sqrt{5}\)\(2\sqrt{6}\)=4\sqrt{30}). In exams identities save long calculations.
Why this answer is correct
The correct answer is A. \(4\sqrt{30}\). (x-2-y-2=(x-y)(x+y)=\(2\sqrt{5}\)\(2\sqrt{6}\)=4\sqrt{30}). In exams identities save long calculations.
Exam Tip
(x-2-y-2=(x-y)(x+y)=\(2\sqrt{5}\)\(2\sqrt{6}\)=4\sqrt{30}) है। परीक्षा में पहचान से लंबी गणना बचती है।
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