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anonymous

  • one year ago

Find the volume bounded by y=4x^3, x+y=5, and x=0 rotated around the x-axis. I used the Washer Method and got π(25-10x+x^2-16x^6)dx [0,4], but I got a ridiculously large number when I solved for the whole thing. The answer is supposed to be 379π/21

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  1. IrishBoy123
    • one year ago
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    answer seems fine :p

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  2. phi
    • one year ago
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    I used the Washer Method (I assume that means you integrated over dy?) if so, notice you have to break the problem into two integrals because the "right boundary" changes. As Irish shows, it makes more sense to use the shell method.

  3. IrishBoy123
    • one year ago
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    yeah, i did the other way first and it is bit more of a pain

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