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.
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Recent Posts
https://youtu.be/zRlUkijc9l0 Solving radical equations can be tricky, especially if you forget to check your solutions. Which is what I used to do in high school... Pay attention to this...
https://youtu.be/GSZYLt5K90U