Question

On ratioalizing 31 / (2 root 2 +5) , we get *



..78

..31( 5 - 2 root 2)/17

..31( 5 + 2 root 2)/23

..none of the above

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Answer 1

Answer:

3rd one is the answer of your question asked

Answer 2

Answer:

$\frac{31}{2 \sqrt{2} + 5 } \\ \frac{31}{2 \sqrt{2} + 5} \times \frac{2 \sqrt{2} - 5}{2 \sqrt{2} - 5 } \\ \frac{31(2 \sqrt{2} - 5)}{ {(2 \sqrt{2} )}^{2} - {(5)}^{2} } \\ \frac{31(2 \sqrt{2} - 5)}{8 - 25} \\ \frac{31(2 \sqrt{2} - 5)}{ - 17} \\ \frac{31(5 - 2 \sqrt{2}) }{17}$

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