यदि \(r=\sqrt{15}-\sqrt{6}\) और \(s=\sqrt{15}+\sqrt{6}\) हैं तो (rs) का मान क्या है?
If \(r=\sqrt{15}-\sqrt{6}\) and \(s=\sqrt{15}+\sqrt{6}\), what is the value of (rs)?
Explanation opens after your attempt
B. (9)
Concept
In conjugate multiplication (rs=\(\sqrt{15}\)2-\(\sqrt{6}\)2=9). Use \(a^2-b^2\) in such questions.
Why this answer is correct
The correct answer is B. (9). In conjugate multiplication (rs=\(\sqrt{15}\)2-\(\sqrt{6}\)2=9). Use \(a^2-b^2\) in such questions.
Exam Tip
संयुग्मी गुणन में (rs=\(\sqrt{15}\)2-\(\sqrt{6}\)2=9) होता है। ऐसे प्रश्नों में \(a^2-b^2\) लगाएं।
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