Question
$$2a\cdot4\cdot6a = 48$$
Answer
$$ \begin{matrix}a_1 = 1 & a_2 = -1 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2a\cdot4\cdot6a &= 48&& \text{simplify left side} \\[1 em]8a\cdot6a &= 48&& \\[1 em]48a^2 &= 48&& \text{move all terms to the left hand side } \\[1 em]48a^2-48 &= 0&& \\[1 em] \end{aligned} $$
$ 48x^{2}-48 = 0 $ is a quadratic equation.
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