Respuesta :
[tex]\bf \textit{vertex of a parabola}\\\\
\begin{array}{lccclll}
g(x) = &-3x^2&+ 18x& + 2\\
&\uparrow &\uparrow &\uparrow \\
&a&b&c
\end{array}\qquad
\left(-\cfrac{{{ b}}}{2{{ a}}}\quad ,\quad {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}\right)[/tex]