Question

Rationalise the Denominator of 1 by 5 - $\sqrt{7}$

Answer 1

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Refer to the attachment!!

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Answer 2

Answer:

$\frac{1}{5 - \sqrt{7} } \times \frac{5 + \sqrt{7} }{5 + \sqrt{7} } \\ \rightarrow \: \frac{5 + \sqrt{7} }{ {5}^{2} - { (\sqrt{7}) }^{2} } \\ \rightarrow \: \frac{5 + \sqrt{7} }{25 - 7} = \frac{5 + \sqrt{7} }{18} \\ hope \: it \: helps \: you...$