\[x^{2} - 3x + 1 = 0\]
\[D = 9 - 4 = 5\]
\[x_{1} = \frac{3 + \sqrt{5}}{2};\]
\[x_{2} = \frac{3 - \sqrt{5}}{2}.\]
\[Ответ:x = \frac{3 \pm \sqrt{5}}{2}.\]