The vertex of a parabola is (-1.5, -12.5), and its y-intercept is (0, -8)
The x-intercepts of the parabola are: (-2, 0), (-4, 0), (2, 0), (4, 0) and (-1, 0), (2, 0), (1, 0), (-2, 0)
Its equation is y+12.5 = (x+1.5)^2, or y = -12.5 + (x+1.5)^2
Check the first possible x-intercept: let x = -2. Does y come out to 0?
y = -12.5 + (-0.5)^2 = -12.5 + 0.25. This is not equal to 0, so (-2,0) is not an x-intercept of this parabola. Continue checking each possible x-intercept until you find the right one (or ones).
