Question
$$2x^2+36x+204 = 708$$
Answer
$$ \begin{matrix}x_1 = -9-3 \sqrt{ 37 } & x_2 = -9+3 \sqrt{ 37 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x^2+36x+204 &= 708&& \text{move all terms to the left hand side } \\[1 em]2x^2+36x+204-708 &= 0&& \text{simplify left side} \\[1 em]2x^2+36x-504 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+36x-504 = 0 $ is a quadratic equation.
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