18х в квадрате -19x+1=0

[tex]18 x^{2} -19x+1=0 \\ D=361-72=289 \\ \sqrt{D} =17 \\ x_{1} = \frac{19+17}{36} = \frac{36}{36} =1 \\ x_{2} = \frac{19-17}{36} = \frac{2}{36} = \frac{1}{18} [/tex]