For finding vertex, problems like ax^2 such as yours, would be (0,0). Problems like ax^2 + c, would be (0, c) and problems like ax^2 + bx + c, would be solved by -b/2a.
Now back to the question, the vertex would be (0,0). And to find other points, you make a table.
X | Y
2 | -8
1 | -2
0 | 0
-1 | -2
2 | -8
To find the X’s you just put the numbers that are to the left and right of 0 (which is the x of the vertex). Then, you plug in those numbers into the equation and solve. You will notice a pattern with the Y’s every time you make a table for a parabola. I hope this helps :)
