Как нарисовать параболу типа y^2=x, в примерах только y=x^2?
$(y+1)^2=2\cdot\frac{1}{4}(x+6)$
\begin{tikzpicture}
% оси и сетка
\draw[->][ very thick] (-8,0)--(8,0) node[anchor=north] {$X$};
\draw[->][ very thick] (0,-8)--(0,8) node[anchor=east] {$Y$};
\draw node[anchor=north east] {$0$};
\draw[help lines , very thin] (-8,-8) grid (8,8);
% парабола
\draw (-6, -1) parabola ????;
\end{tikzpicture}