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

\[ \begin{align} & \Delta =(-10)^{2}-4.3.3\\ & \Delta =100-36\\ & \Delta=64 \end{align} \]

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

\[ \begin{align} & x_{1,2}=\frac{-(-10)\pm\sqrt{64\;}}{2.3}\\ & x_{1,2}=\frac{10\pm8}{6}\\ & x_{1}=\frac{10+8}{6}=\frac{18}{6}=3\\ & x_{2}=\frac{10-8}{6}=\frac{2:2}{6:2}=\frac{1}{3} \end{align} \]

\[ \bbox[#FFCCCC,10px] {V=\left\{3,\frac{1}{3}\right\}} \]