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|dw:1327944140729:dw|

It depends what the question is! Are you trying to do volumes of revolution?

|dw:1327944180016:dw|

Ah, sorry!

can u see the picture?

Yep!

I am doing vloumes btw

but y is the answer not negative?

ohhh. See this an example in my book and I dont get how they got this answer :D

Like the sign was confusing me too

well i ised u subsitution so that is y u have the negative

Oops, I think your way is right too. It still gives a positive answer at the end, 125pi/3, I think

So yep, it was right after all! Sorry!

No wait, negative either way.

idk something is wierd. how can volume be negative hehehe

The answer must be positive but how did they get that?

Ok, I finally got it!

ok

Substituting 5 gives 0, and substituting 0 gives:

yes?

|dw:1327945594263:dw|

ya bt then it shld be negative?

So you get -125. BUT, then you do 0-(-125) = 125

ohhhh i thought it was the opposite way around

Not the way you've written it.

It's traditionally the top one substituted minus the bottom one substituted.

Glad we got there in the end!

Thanks :)