If x4 + 1/(x^4) = 15127, the positive value of x - 1/x is?

x⁴ + \(\frac{1}{x^4}\) = 15127

x² + \(\frac{1}{x^2}\) = \(\sqrt {15127 + 2}\) = 123

So, x - \(\frac{1}{x}\) = \(\sqrt {123 - 2}\) = 11