Question

please tell me this question​

Answer 1

Answer

$\sf<strong> </strong>\frac{1}{2 \sqrt{3} + \sqrt{7} } \\ \\ = \frac{1}{2 \sqrt{3} + \sqrt{7}} \times \frac{2 \sqrt{3} - \sqrt{7}}{ 2\sqrt{3} - \sqrt{7}} \\ \\ = \frac{ 2\sqrt{3} - \sqrt{7} }{12 - 7} \\ \\ = \frac{2 \sqrt{3} - \sqrt{7} }{5}$