Volumes by cylindrical shells?

Boater

New member
Use the method of cylindrical hsells to find the volume generated by rotating the region bounded by the given curves about the specified axis.

y=x^2; y=2 - x^2; about x=1

I think r=y and I think h=2 - x^2 but I don't know what to do with "about x=1". Could someone explain what that means and how it affects the formula
 
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