$$3x-1+2x^2+x+9 = 0$$
Answer
$$ \begin{matrix}x_1 = -1+\sqrt{ 3 }i & x_2 = -1-\sqrt{ 3 }i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x-1+2x^2+x+9 &= 0&& \text{simplify left side} \\[1 em]2x^2+4x+8 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+4x+8 = 0 $ is a quadratic equation.
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