1) Compute the intersection point by hand and verify that it is the same as that obtained graphically. You may need to use the quadratic formula or factor.
2) Move the red line downward until the graphs no longer intersect. The equation of the new line will be displayed in the box at left. Algebraically compute the intersection using the quadratice formula. What type of solutions do you get? How does that relate to the fact that there is no intersection of the graphs?
Reva Narasimhan, Created with GeoGebra