$$(x+3)^2 = 0$$
Answer
$$ x = -3 $$
Explanation
$$ \begin{aligned} (x+3)^2 &= 0&& \text{simplify left side} \\[1 em]x^2+6x+9 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+6x+9 = 0 $ is a quadratic equation.
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