$$8x^4-2x^3+5x-1 = 0$$
Answer
$$ \begin{matrix}x_1 = 0.20064 & x_2 = -0.84173 & x_3 = 0.44555+0.73597i \\[1 em] x_4 = 0.44555-0.73597i & \\[1 em] \end{matrix} $$
Explanation
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
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