Question

plz give the answer plz don't spam​

Answer 1

$\frac{1}{ \sqrt{7} + \sqrt{2} } \\ = \frac{1( \sqrt{7 } - \sqrt{2} )}{ ({ \sqrt{7} })^{2} - ({ \sqrt{2} )}^{2} } \\ = \frac{ \sqrt{7} - \sqrt{2} }{7 - 2} \\ = \frac{ \sqrt{7} - \sqrt{2} }{5}$

Thank you