$$(4x+2)^2 = 0$$
Answer
$$ x = -\frac{ 1 }{ 2 } $$
Explanation
$$ \begin{aligned} (4x+2)^2 &= 0&& \text{simplify left side} \\[1 em]16x^2+16x+4 &= 0&& \\[1 em] \end{aligned} $$
$ 16x^{2}+16x+4 = 0 $ is a quadratic equation.
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