\[ \bbox[#99CCFF,10px] {\Delta =b^{2}-4ac} \]

\[ \begin{align} & \Delta =(-17)^{2}-4.3.10\\ & \Delta =289-120\\ & \Delta=169 \end{align} \]

\[ \bbox[#99CCFF,10px] {x_{1,2}=\frac{-b\pm \sqrt{\Delta \;}}{2a}} \]

\[ \begin{align} & x_{1,2}=\frac{-(-17)\pm\sqrt{169\;}}{2.3}\\ & x_{1,2}=\frac{17\pm13}{6}\\ & x_{1}=\frac{17+13}{6}=\frac{30}{6}=5\\ & x_{2}=\frac{17-13}{6}=\frac{4:2}{6:2}=\frac{2}{3} \end{align} \]

\[ \bbox[#FFCCCC,10px] {V=\left\{5,\frac{2}{3}\right\}} \]