$$x^4+3x^3+50x^2+x+10^6 = 0$$
Answer
$$ \begin{matrix}x_1 = 21.34865+22.6023i & x_2 = 21.34865-22.6023i & x_3 = -22.84865+22.63762i \\[1 em] x_4 = -22.84865-22.63762i & \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^4+3x^3+50x^2+x+10^6 &= 0&& \text{simplify left side} \\[1 em]x^4+3x^3+50x^2+x+1000000 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
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Polynomial Equations Solver