Question

pls solve this ques plss no irrevelent ans as I'm a moderator in my another account

Answer 1

Answer:

the correct answer is 5.

Answer 2

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$\frac{ \sqrt{7} - \sqrt{3} }{ \sqrt{7} + \sqrt{3} } + \frac{ \sqrt{7} + \sqrt{3} }{ \sqrt{7} - \sqrt{3} } \\ \\ = \frac{ \sqrt{7} - \sqrt{3} }{ \sqrt{7} + \sqrt{3} } \times \frac{ \sqrt{7} + \sqrt{3} }{ \sqrt{7} + \sqrt{3} } \\ \\ = \frac{( \sqrt{7) {}^{2} } + ( \sqrt{3)} {}^{2} - 2 \sqrt{21} }{4} \\ \\ = \frac{10 - 2 \sqrt{21} }{4} \\ \\ = \frac{5 - 2 \sqrt{21} }{2} \\ \\ \frac{5 - 2 \sqrt{21} }{2} + \frac{5 + 2 \sqrt{21} }{2} \\ \\ = \frac{5 - 2 \sqrt{21} + 5 + 2 \sqrt{21} }{2} \\ \\ = \frac{5 + 5}{2} \: \\ \\ \frac{10}{2} \\ \\ = 5 \: \: \: answer$

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