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It depends what the question is! Are you trying to do volumes of revolution?
can u see the picture?
I am doing vloumes btw
but y is the answer not negative?
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.
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
You can always expand brackets like that to check. It gives h sqaured plus 4h plus 4, before integrating
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!
When find the answer (after integrating), you substitute in 5, and then SUBTRACT the answer of when you substitute 0.
Substituting 5 gives 0, and substituting 0 gives:
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!