Quantitative Aptitude Algebra

\(\rm x^4+\frac{1}{x^4}=727\) என்றால், x > 0, \(\rm \left(x-\frac{1}{x}\right)\) இன் மதிப்பு என்ன ?

1
3√3
2
\(\sqrt{21}\)
3
5
4
7

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