You can put this solution on YOUR website! This one is factorable. Find the zeros and the x coordinate of the vertex; and use this to evaluate y for this vertex. Pick two or three more x values and find corresponding y values. Just plot all these points and do you best sketching.
To start,
y=x(x-6) so the zeros will be 0 and 6.
The x coordinate for the vertex is at x=3, the exact middle of 0 and 6.
...
(