x4 + 2x2 + 1 = 5x2 হলে, \(x + \frac{1}{x}\) = কত ?
Correct Answer: Option D
x4+2x2 +1 = 5x2
বা, x4 +1 = 3x2
বা, x2 \((x2 + \frac{1}{{x2}}) = 3x2\) বা, \(x2 + \frac{1}{{x2}} = 3\) বা, \((x + \frac{1}{x})2 - 2.x.\frac{1}{x} = 3\) বা, \((x + \frac{1}{x})2\) = 3+2
\(x + \frac{1}{x} = \sqrt 5 \)
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