$$0 = x^2-4x+1$$
Answer
$$ \begin{matrix}x_1 = 2-\sqrt{ 3 } & x_2 = 2+\sqrt{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 0 &= x^2-4x+1&& \text{move all terms to the left hand side } \\[1 em]0-x^2+4x-1 &= 0&& \text{simplify left side} \\[1 em]-x^2+4x-1 &= 0&& \\[1 em] \end{aligned} $$
$ -x^{2}+4x-1 = 0 $ is a quadratic equation.
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