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Math Help - [SOLVED] Area of a Surface of Revolution

  1. #1
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    [SOLVED] Area of a Surface of Revolution

    As I was checking my answers in my solution manual, one of the parts in it was this:

    How do I change from x + 1/4 from the first part, into [1/8 (4x+1) ...] from the second part? I thought the x + 1/4 would turn into 1/4(4x + 1)?
    Where did the 1/8 come from?
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  2. #2
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    It's (x+1/4)^3/2, so when you take the 1/4 out of the brackets it becomes (1/4)^3/2 = (1/2)^3 = 1/8.
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  3. #3
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    Thanks! I understand now.
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