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