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Jan 2012 OCR C4 question?

https://gyazo.com/39249ddf9fc63656d3b36795501ea4cf

Any advice on this, I've checked the markscheme and my answer is completely wrong :/

Reply 1

Notnek

Original post by kalvin689

https://gyazo.com/39249ddf9fc63656d3b36795501ea4cf

Any advice on this, I've checked the markscheme and my answer is completely wrong :/

Please post your working.

Reply 2

nerak99

A common error is to forget to change the limits as well as the function of x in the integration. This leads to the error you describe.

Reply 3

Zacken

Original post by nerak99

A common error is to forget to change the limits as well as the function of x in the integration. This leads to the error you describe.

What error has he described?

Reply 4

kalvin689

Ok I've solved this and yeh I forgot to change the limits, cheers

Reply 5

nerak99

Original post by Zacken

What error has he described?

The clue was the fact that his answer was "completely wrong" and he was surprised.

In my experience, assuming a reasonably competent candidate, the most common cause of "completely wrong" with substitution questions is forgetting to change limits.

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