Teaching BSSTET Special Educator (Paper 1 & 2) Mock Test 2024 Quantitative Aptitude Algebra

যদি \(\rm x^4+\frac{1}{x^4}=727\), x > 0 হয়, তাহলে \(\rm \left(x-\frac{1}{x}\right)\) এর মান কত?

1
3√3
2
\(\sqrt{21}\)
3
5
4
7
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