anonymous
  • anonymous
Can someone tell me if this is correct?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1327944140729:dw|
anonymous
  • anonymous
It depends what the question is! Are you trying to do volumes of revolution?
anonymous
  • anonymous
|dw:1327944180016:dw|

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anonymous
  • anonymous
Ah, sorry!
anonymous
  • anonymous
can u see the picture?
anonymous
  • anonymous
Yep!
anonymous
  • anonymous
I am doing vloumes btw
anonymous
  • anonymous
but y is the answer not negative?
anonymous
  • anonymous
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.
anonymous
  • anonymous
ohhh. See this an example in my book and I dont get how they got this answer :D
anonymous
  • anonymous
Like the sign was confusing me too
anonymous
  • anonymous
You can always expand brackets like that to check. It gives h sqaured plus 4h plus 4, before integrating
anonymous
  • anonymous
well i ised u subsitution so that is y u have the negative
anonymous
  • anonymous
Oops, I think your way is right too. It still gives a positive answer at the end, 125pi/3, I think
anonymous
  • anonymous
So yep, it was right after all! Sorry!
anonymous
  • anonymous
No wait, negative either way.
anonymous
  • anonymous
idk something is wierd. how can volume be negative hehehe
anonymous
  • anonymous
The answer must be positive but how did they get that?
anonymous
  • anonymous
Ok, I finally got it!
anonymous
  • anonymous
When find the answer (after integrating), you substitute in 5, and then SUBTRACT the answer of when you substitute 0.
anonymous
  • anonymous
ok
anonymous
  • anonymous
Substituting 5 gives 0, and substituting 0 gives:
anonymous
  • anonymous
yes?
anonymous
  • anonymous
|dw:1327945594263:dw|
anonymous
  • anonymous
ya bt then it shld be negative?
anonymous
  • anonymous
So you get -125. BUT, then you do 0-(-125) = 125
anonymous
  • anonymous
ohhhh i thought it was the opposite way around
anonymous
  • anonymous
Not the way you've written it.
anonymous
  • anonymous
It's traditionally the top one substituted minus the bottom one substituted.
anonymous
  • anonymous
Glad we got there in the end!
anonymous
  • anonymous
Thanks :)

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