The Student Room Group

Core Maths 3: Integration to find a volume

Hi there

Please could someone check the below, as I am getting a different answer to whats in the book;



Many thanks :smile:

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Reply 1
You have substituted incorrectly on the final line
Reply 2
Original post by TenOfThem
You have substituted incorrectly on the final line


Sorry to be a jummy but please could you tell me how I have gone wrong.

Thank you
Reply 3
2 squared = 4

1/2 of 4 = 2

2/2 = 1


you got 1/2
Reply 4
edit: my bad ignore me im being blind :smile: sorry

shouldnt you be integrating (Ï€x2)dy (\pi x^2) dy instead of (Ï€x)dy (\pi x) dy ?
(edited 11 years ago)
Reply 5
Original post by just george
shouldnt you be integrating (Ï€x2)dy (\pi x^2) dy instead of (Ï€x)dy (\pi x) dy ?


she did
Reply 6
Original post by TenOfThem
she did


I see, sorry ignore me im being blind.. happy easter :tongue:
Reply 7
Original post by just george
I see, sorry ignore me im being blind.. happy easter :tongue:


T'is the chocolate :smile:
Reply 8
Original post by TenOfThem
T'is the chocolate :smile:


its good stuff though.. malteasters.. nomnomnom..

:tongue:
Reply 9
Original post by just george
its good stuff though.. malteasters.. nomnomnom..

:tongue:


I got a malteaster egg with malteaser bunnies in it :biggrin:
Original post by TenOfThem
I got a malteaster egg with malteaser bunnies in it :biggrin:


I got a malteaser egg with malteasers in it.

:frown:
Original post by Mr M
I got a malteaser egg with malteasers in it.

:frown:


Was yours not a malteasTer egg ... check the box :smile:
Original post by TenOfThem
Was yours not a malteasTer egg ... check the box :smile:


Nope.
Original post by Mr M
Nope.


:frown:
Reply 14
ok yeah I see what I did wrong, thank you :smile:

Happy Easter to you all xxx
Mr M
..


TenOfThem
....


Do you both work at the same school?
Original post by boromir9111
Do you both work at the same school?


No
Reply 17
Original post by boromir9111
Do you both work at the same school?


Haha.

Cheeky.
Original post by boromir9111
Do you both work at the same school?


No but I've known her for about 10 years online.
Original post by Mr M
No but I've known her for about 10 years online.


lol....ok :biggrin:

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