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    https://gyazo.com/39249ddf9fc63656d3b36795501ea4cf

    Any advice on this, I've checked the markscheme and my answer is completely wrong :/
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    (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.
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    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.
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    (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?
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    Ok I've solved this and yeh I forgot to change the limits, cheers
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    (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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