$$4x^2 = 256$$
Answer
$$ \begin{matrix}x_1 = 8 & x_2 = -8 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 4x^2 &= 256&& \text{move all terms to the left hand side } \\[1 em]4x^2-256 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}-256 = 0 $ is a quadratic equation.
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