Question
$$-18x^2+198-246 = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 2 \sqrt{ 6}}{ 3 } i & x_2 = -2 \dfrac{\sqrt{ 6 }}{ 3 } i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -18x^2+198-246 &= 0&& \text{simplify left side} \\[1 em]-18x^2-48 &= 0&& \\[1 em] \end{aligned} $$
$ -18x^{2}-48 = 0 $ is a quadratic equation.
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