Question
$$3(x-2)(x+4) = 0$$
Answer
$$ \begin{matrix}x_1 = 2 & x_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3(x-2)(x+4) &= 0&& \text{simplify left side} \\[1 em](3x-6)(x+4) &= 0&& \\[1 em]3x^2+12x-6x-24 &= 0&& \\[1 em]3x^2+6x-24 &= 0&& \\[1 em] \end{aligned} $$
$ 3x^{2}+6x-24 = 0 $ is a quadratic equation.
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