Question

rationalize this.................

Answer 1

The answer is
$( \sqrt{n - 1} \: \: - \: \: \sqrt{n + 1} \: ) \div ( { \sqrt{n - 1}) }^{2} - \: { (\sqrt{n + 1} )}^{2}$
$\sqrt{n - 1} \: - \sqrt{n + 1} \div n \: - 1 \: - n \: - 1$
$\sqrt{n - 1} \: - \: \sqrt{n + 1} \div - 2$
$\sqrt{n + 1} - \sqrt{n - 1} \div 2$
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Answer 2

Hope it helps.........