Question: how to fill the area between two curves?

I'm trying to plot and fill the area between these two curves from x[0,450]




I can do it separately but when I do them together, it gives me extra area that isn't shared between the two curves.

Also, whenever I try to plot them together I get the following error message:

Error, (in plot) unexpected option: 2+0.2e-3*x^2


Any help will be greatly appreciated!

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