$$x^2 = 2\cdot(-10+2x)$$
Answer
$$ \begin{matrix}x_1 = 2+4i & x_2 = 2-4i \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2 &= 2\cdot(-10+2x)&& \text{simplify right side} \\[1 em]x^2 &= -20+4x&& \\[1 em]x^2 &= 4x-20&& \text{move all terms to the left hand side } \\[1 em]x^2-4x+20 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-4x+20 = 0 $ is a quadratic equation.
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