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