यदि \(c=\sqrt{15}+\sqrt{6}\) और \(d=\sqrt{15}-\sqrt{6}\) हैं तो (cd) और (c-d) का सही युग्म कौन-सा है?
If \(c=\sqrt{15}+\sqrt{6}\) and \(d=\sqrt{15}-\sqrt{6}\), which is the correct pair of (cd) and (c-d)?
Explanation opens after your attempt
Correct Answer
A. (9), \(2\sqrt{6}\)
Concept
(cd=15-6=9) and \(c-d=2\sqrt{6}\). Find both values separately in a conjugate pair.
Why this answer is correct
The correct answer is A. (9), \(2\sqrt{6}\). (cd=15-6=9) and \(c-d=2\sqrt{6}\). Find both values separately in a conjugate pair.
Exam Tip
(cd=15-6=9) और \(c-d=2\sqrt{6}\) है। संयुग्मी युग्म में दोनों मान अलग-अलग निकालें।
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