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5x^(1/2)-9x^(1/4)+3=0
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heres what wolf has to say http://www.wolframalpha.com/input/?i=5x%5E%281%2F2%29-9x%5E%281%2F4%29%2B3%3D0
First Solve \[5 u^2-9 u+3=0 \] then \[ x =u^4 \]
\[ x= \frac{9 \left(239-51 \sqrt{21}\right)}{1250} \\ x=\frac{9 \left(239+51 \sqrt{21}\right)}{1250} \\ \]
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