$$2x^4-3x^3+4x^2+17x+7 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 1 }{ 2 } & x_2 = -1.09537 & x_3 = 1.54768+1.99881i \\[1 em] x_4 = 1.54768-1.99881i & \\[1 em] \end{matrix} $$
Explanation
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