$$2x^3+3x^2+x+9-x^2 = 0$$
Answer
$$ \begin{matrix}x_1 = -1.93902 & x_2 = 0.46951+1.44925i & x_3 = 0.46951-1.44925i \end{matrix} $$
Explanation
$$ \begin{aligned} 2x^3+3x^2+x+9-x^2 &= 0&& \text{simplify left side} \\[1 em]2x^3+2x^2+x+9 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
This page was created using
Polynomial Equations Solver