$$(2x+3)^2 = 0$$
Answer
$$ x = -\frac{ 3 }{ 2 } $$
Explanation
$$ \begin{aligned} (2x+3)^2 &= 0&& \text{simplify left side} \\[1 em]4x^2+12x+9 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}+12x+9 = 0 $ is a quadratic equation.
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