Can someone tell me if this is correct?

- anonymous

Can someone tell me if this is correct?

- Stacey Warren - Expert brainly.com

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- anonymous

|dw:1327944140729:dw|

- anonymous

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

- anonymous

|dw:1327944180016:dw|

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- anonymous

Ah, sorry!

- anonymous

can u see the picture?

- anonymous

Yep!

- anonymous

I am doing vloumes btw

- anonymous

but y is the answer not negative?

- 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

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

- anonymous

Like the sign was confusing me too

- anonymous

You can always expand brackets like that to check. It gives h sqaured plus 4h plus 4, before integrating

- anonymous

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

- anonymous

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

- anonymous

So yep, it was right after all! Sorry!

- anonymous

No wait, negative either way.

- anonymous

idk something is wierd. how can volume be negative hehehe

- anonymous

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

- anonymous

Ok, I finally got it!

- anonymous

When find the answer (after integrating), you substitute in 5, and then SUBTRACT the answer of when you substitute 0.

- anonymous

ok

- anonymous

Substituting 5 gives 0, and substituting 0 gives:

- anonymous

yes?

- anonymous

|dw:1327945594263:dw|

- anonymous

ya bt then it shld be negative?

- anonymous

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

- anonymous

ohhhh i thought it was the opposite way around

- anonymous

Not the way you've written it.

- anonymous

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

- anonymous

Glad we got there in the end!

- anonymous

Thanks :)

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