$$x^2-10x = 20$$
Answer
$$ \begin{matrix}x_1 = 5-3 \sqrt{ 5 } & x_2 = 5+3 \sqrt{ 5 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2-10x &= 20&& \text{move all terms to the left hand side } \\[1 em]x^2-10x-20 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-10x-20 = 0 $ is a quadratic equation.
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