यदि \(x=\sqrt{2}+\sqrt{5}\) और \(y=\sqrt{5}-\sqrt{2}\), तो (xy) का मान क्या है?
If \(x=\sqrt{2}+\sqrt{5}\) and \(y=\sqrt{5}-\sqrt{2}\), what is the value of (xy)?
Explanation opens after your attempt
A. (3)
Concept
View the product as (\(\sqrt{5}+\sqrt{2}\)\(\sqrt{5}-\sqrt{2}\)).
Why this answer is correct
It gives (5-2=3).
Exam Tip
You can rearrange the order of addition to recognize a conjugate form. चरण 1: गुणन को (\(\sqrt{5}+\sqrt{2}\)\(\sqrt{5}-\sqrt{2}\)) की तरह देखें। चरण 2: यह (5-2=3) देता है। चरण 3: जोड़ के क्रम को बदलकर संयुग्मी रूप पहचान सकते हैं।
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