x > 1 అయితే, మరియు \(\rm x^4+\frac{1}{x^4}=79\) అయితే, \(\rm x-\frac{1}{x} \) విలువ ఎంత?

1
2√2
2
√7
3
\(\sqrt{11} \)
4
\( \sqrt{10}\)

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