When at least two points are on a vertical line x coordinate of A equals the x coordinate of B for example no equation is found for a parabola with vertical axis. Finally substitute the values you found for a b and c into the general equation to generate the equation for your parabola. Select three ordered pairs from the table.
F x ax2 bx c.
-- Enter Point 2. Here is its graph. An exact one top one where the coefficients are in fractional forms an the second with approximated coefficients whose number of decimal number of decimal places may be chosen. Plug in the coordinates for x and y into the general form.