[tex]\bf ~~~~~~\textit{vertical parabola vertex form} \\\\ y=a(x- h)^2+ k\qquad \begin{cases} \stackrel{vertex}{(h,k)}\\\\ \stackrel{"a"~is~negative}{op ens~\cap}\qquad \stackrel{"a"~is~positive}{ope ns~\cup} \end{cases} \\\\[-0.35em] ~\dotfill\\\\ y = (x-\stackrel{h}{5})^2+\stackrel{k}{3}\qquad \qquad \stackrel{vertex}{(5,3)}[/tex]
