$$-x^2-4x+4 = 0$$
Answer
$$ \begin{matrix}x_1 = -2-2 \sqrt{ 2 } & x_2 = -2+2 \sqrt{ 2 } \\[1 em] \end{matrix} $$
Explanation
$ -x^{2}-4x+4 = 0 $ is a quadratic equation.
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