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anonymous

  • 4 years ago

Can someone tell me if this is correct?

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  1. anonymous
    • 4 years ago
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    |dw:1327944140729:dw|

  2. anonymous
    • 4 years ago
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    It depends what the question is! Are you trying to do volumes of revolution?

  3. anonymous
    • 4 years ago
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    |dw:1327944180016:dw|

  4. anonymous
    • 4 years ago
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    Ah, sorry!

  5. anonymous
    • 4 years ago
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    can u see the picture?

  6. anonymous
    • 4 years ago
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    Yep!

  7. anonymous
    • 4 years ago
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    I am doing vloumes btw

  8. anonymous
    • 4 years ago
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    but y is the answer not negative?

  9. anonymous
    • 4 years ago
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    Great! I've got a feeling you've got your signs a bit muddled though. (5-h) squared is the same as (h-5) squared, so I don't think that minus should be there.

  10. anonymous
    • 4 years ago
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    ohhh. See this an example in my book and I dont get how they got this answer :D

  11. anonymous
    • 4 years ago
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    Like the sign was confusing me too

  12. anonymous
    • 4 years ago
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    You can always expand brackets like that to check. It gives h sqaured plus 4h plus 4, before integrating

  13. anonymous
    • 4 years ago
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    well i ised u subsitution so that is y u have the negative

  14. anonymous
    • 4 years ago
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    Oops, I think your way is right too. It still gives a positive answer at the end, 125pi/3, I think

  15. anonymous
    • 4 years ago
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    So yep, it was right after all! Sorry!

  16. anonymous
    • 4 years ago
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    No wait, negative either way.

  17. anonymous
    • 4 years ago
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    idk something is wierd. how can volume be negative hehehe

  18. anonymous
    • 4 years ago
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    The answer must be positive but how did they get that?

  19. anonymous
    • 4 years ago
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    Ok, I finally got it!

  20. anonymous
    • 4 years ago
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    When find the answer (after integrating), you substitute in 5, and then SUBTRACT the answer of when you substitute 0.

  21. anonymous
    • 4 years ago
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    ok

  22. anonymous
    • 4 years ago
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    Substituting 5 gives 0, and substituting 0 gives:

  23. anonymous
    • 4 years ago
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    yes?

  24. anonymous
    • 4 years ago
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    |dw:1327945594263:dw|

  25. anonymous
    • 4 years ago
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    ya bt then it shld be negative?

  26. anonymous
    • 4 years ago
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    So you get -125. BUT, then you do 0-(-125) = 125

  27. anonymous
    • 4 years ago
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    ohhhh i thought it was the opposite way around

  28. anonymous
    • 4 years ago
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    Not the way you've written it.

  29. anonymous
    • 4 years ago
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    It's traditionally the top one substituted minus the bottom one substituted.

  30. anonymous
    • 4 years ago
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    Glad we got there in the end!

  31. anonymous
    • 4 years ago
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    Thanks :)

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