I am having troubles in fillng a particular region in a plot. I'm trying ot use Mathematica to plot the same image I linked below, and this is ok (except for all the numbers/letters labeling but this is not important).
What I have troubles with, is how to fill the region below the $x$-axis but above the green curve.
And again, I would also know how instead fill the entire region above the green curve, but under the parabola. I tried many combination of the filling code but no results.