Question

if you know how to do it then please tell !​

Answer 1

Answer:

This is the answer hope its correct

Answer 2

Answer:

• $\dfrac{42}{11}$

Step-by-step explanation:

We have,

$\begin{aligned} \\ & \quad \left( \frac{4 + \sqrt{5} }{4 - \sqrt{5} } \right) + \left( \frac{4 - \sqrt{5} }{4 + \sqrt{5} } \right) \\ \\ & = \frac{ {(4 + \sqrt{5} )}^{2} + {(4 - \sqrt{5} )}^{2} }{(4 - \sqrt{5})(4 + \sqrt{5} ) } \\ \\ & = \frac{ {(4 + \sqrt{5}) }^{2} + {(4 - \sqrt{5} )}^{2} }{ {(4)}^{2} - {( \sqrt{5} )}^{2} } \\ \\ & = \frac{16 + 5 + \cancel{8 \sqrt{5}} + 16 + 5 - \cancel{ 8 \sqrt{5}} }{16 - 5} \\ \\ & = \bf \frac{42}{11} \end{aligned}$

$\mid \underline{\underline{\LARGE\bf\green{Brainliest \: Answer}}}\mid$

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