Question

rational sing the denominator of ​

Answer 1

Answer:

hope it helps you!!!!!!!!

Answer 2

Answer:

$\frac{4 - \sqrt{5} }{11}$

Step-by-step explanation:

$\frac{1}{4 + \sqrt{5} } = \frac{1}{4 + \sqrt{5} } \times \frac{4 - \sqrt{5} }{4 - \sqrt{5} } \\ = \frac{4 - \sqrt{5} }{ {4}^{2} - { (\sqrt{5} })^{2} } = \frac{4 - \sqrt{5} }{16 - 5} = \frac{4 - \sqrt{5} }{11} .$