Practicing Success
Practicing Success
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If x4 + \(\frac{1}{x^4}\) = 6887 Find x - \(\frac{1}{x}\) |
12 15 9 8 |
9 |
x4 + \(\frac{1}{x^4}\) = 6887 x2 + \(\frac{1}{x^2}\) = \(\sqrt {6887 + 2}\) = 83 So, x - \(\frac{1}{x}\) = \(\sqrt {83 - 2}\) = 9 |
