1. Just a few more examples -

2. Ex 5 p. 471 Shell method necessary Find the volume of the solid formed by revolving the region bounded by the graphs of y = x 3 + x + 1, y = 1, x = 1, about the line x = 2. r = 1 R= 2 - x Whoops! Can’t have x inside, yet can’t switch y = x 3 + x + 1 to x = y-something Try disk method: x Shell method: h=y-1 p=2-x

3. http://youtu.be/CiXME1u-oyU 7.3b p. 472/ 21-29 odd, 31-33. 41, 43 QUIZ 7.3 Thursday, Feb 9