Question
$$4(x+3)^2 = 0$$
Answer
$$ x = -3 $$
Explanation
$$ \begin{aligned} 4(x+3)^2 &= 0&& \text{simplify left side} \\[1 em]4(x^2+6x+9) &= 0&& \\[1 em]4x^2+24x+36 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}+24x+36 = 0 $ is a quadratic equation.
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