$$(2x-4)(x+3) = 0$$
Answer
$$ \begin{matrix}x_1 = 2 & x_2 = -3 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (2x-4)(x+3) &= 0&& \text{simplify left side} \\[1 em]2x^2+6x-4x-12 &= 0&& \\[1 em]2x^2+2x-12 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+2x-12 = 0 $ is a quadratic equation.
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