Question

Which equation matches the graph shown below?

Answer 1

I am pretty sure it is the 3rd one down

Answer 2

For this case, what we are going to do is verify in which points the function is equal to zero.
 We have the points are:
 x = (-b +/- root (b ^ 2 -4 * a * c)) / (2 * a)
 We substitute the values in the equations shown and verify that the equality is met.
 For y = 2x2 + 8x - 5
 x1 = -2-root (13/2)
 x2 = root (13/2) - 2
 These roots coincide with the cut points of the graph on the x axis.
 Answer:
 The equation is:
 y = 2x2 + 8x - 5
 option 4