यदि \(a=\sqrt{7}+\sqrt{3}\) और \(b=\sqrt{7}-\sqrt{3}\) हैं, तो (ab) और (a+b) का सही युग्म कौन-सा है?
If \(a=\sqrt{7}+\sqrt{3}\) and \(b=\sqrt{7}-\sqrt{3}\), which is the correct pair of (ab) and (a+b)?
Explanation opens after your attempt
A. (4), \(2\sqrt{7}\)
Concept
(ab=7-3=4) and \(a+b=2\sqrt{7}\). In conjugates check product and sum separately.
Why this answer is correct
The correct answer is A. (4), \(2\sqrt{7}\). (ab=7-3=4) and \(a+b=2\sqrt{7}\). In conjugates check product and sum separately.
Exam Tip
(ab=7-3=4) और \(a+b=2\sqrt{7}\) है। संयुग्मी में गुणन और योग अलग-अलग देखें।
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