$$4x^5-9x^3-8x^2+18 = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 3 }{ 2 } & x_2 = -\dfrac{ 3 }{ 2 } & x_3 = 1.25992 \\[1 em] x_4 = -0.62996+1.09112i & x_5 = -0.62996-1.09112i \\[1 em] \end{matrix} $$
Explanation
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