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tatiyna
3 years ago
6

Which of the following integrals will find the volume of the solid that is formed when the region bounded by the graphs of y=e^x

, x=1, and y=1 is revolved around the line y=-2?

Mathematics
1 answer:
dimulka [17.4K]3 years ago
7 0

The fourth option is correct.

See the attached image. The red cylinder represents a washer formed by the described revolution. Its volume is

\pi((\text{outer radius})^2-(\text{inner radius})^2)(\text{height})

so when we integrate, we take

\displaystyle\pi\int_0^1((e^x+2)^2-3^2)\,\mathrm dx

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