$$9x^2+2x+16 = 0$$
Answer
$$ \begin{matrix}x_1 = -\dfrac{ 1 }{ 9 }+\dfrac{\sqrt{ 143 }}{ 9 }i & x_2 = -\dfrac{ 1 }{ 9 }-\dfrac{\sqrt{ 143 }}{ 9 }i \\[1 em] \end{matrix} $$
Explanation
$ 9x^{2}+2x+16 = 0 $ is a quadratic equation.
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