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
