How can I know color the are of the parabola, say, of the positive x values? I'm using Inkscape for creating the figures.
I would solve it this way:
- draw a straight line to connect the curve with your
Ctrlpressed to ensure the line is straight)
- use the
fill bounded areastool (paintbucket icon, the
Uhotkey) by clicking anywhere on the enclosed area formed by the curve, the axis, and the line you just drew