With solids of revolution, your method may depend on what the problem calls for. I start with Shell Method, because everything was given in terms of x. And we were needing to revolve the solid around x = 7. But the questions on an exam may say to use the Washer Method, so I show it that way, too.

Remember that success is a planned event. Believe in yourself.

Pay attention, do the work, and don’t give up!

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