Respuesta :

[tex]\bf \qquad \textit{parabola vertex form}\\\\ \begin{array}{llll} y=a(x-{{ h}})^2+{{ k}}\\\\ x=a(y-{{ k}})^2+{{ h}} \end{array} \qquad\qquad vertex\ ({{ h}},{{ k}})\\\\ -------------------------------\\\\ y=-(x-\stackrel{h}{2})^2\stackrel{k}{-1}\qquad \qquad \stackrel{vertex~(h,k)}{(2,-1)}[/tex]

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