Fourth root?

Algebra Level 3

Find the integer which is closest to

1 5 4 + 1 4 5 4 1 4 \frac{1}{\sqrt[4]{5^4+1}-\sqrt[4]{5^4-1}}


The answer is 250.

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1 solution

Edwin Gray
Sep 23, 2018

(5^4 + 1)^(1/4) = 5.001998801, (5^4 - 1)^(1/4) = 4.997998799. The difference is 4.000002x10^(-3), and its reciprocal is 249.999875. Ed Gray

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