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Math Help - integrate to find volume

  1. #1
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    integrate to find volume

    for curve y= [(x+1)^0.5]/x
    area bounded by x-axis, x=3 to x=5
    and rotated about x-axis
    find volume of this solid

    i got 1.47 units sq but ans. is 2.02 units sq

    do you need to let u=... eg x=1
    or something?
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  2. #2
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    Quote Originally Posted by dodoje View Post
    for curve y= [(x+1)^0.5]/x
    area bounded by x-axis, x=3 to x=5
    and rotated about x-axis
    find volume of this solid

    i got 1.47 units sq but ans. is 2.02 units sq

    do you need to let u=... eg x=1
    or something?
    Showing your working would help to find your mistake(s).

    V = \pi \int_3^5 \frac{x+1}{x^2} \, dx = \pi \int_3^5 \frac{1}{x} + \frac{1}{x^2} \, dx.

    I'd hope this integral was easy for you to do ......
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  3. #3
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    i get what i did wrong
    used a different method that didn't work out

    thanks!
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