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C2 REALLY BASIC definite integral question, book has wrong answer? watch

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    Evaluate the definite integral of [1 - 2x - 3x^2 - 4x^3] limits: 3 on top, 2 on bottom.

    integrating: x - x^2 - x^3 - x^4
    substituting 3, answer is -114.
    substituting 0, answer is -26.

    -114--26 = -114 + 26 = -88.

    books answer: 1/8

    :confused:
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    Whatever the answer is, it's going to be a whole number. The book's definitely wrong there.
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    either the book is wrong or you've read something wrong,
    is it MEI? our books from them are awful
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    just do the math bro. whats wrong with you?
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    (Original post by jakeee)
    just do the math bro. whats wrong with you?
    clearly i did do the maths..

    the book gave a different answer to me like 6 times in a row, so i made this thread to see whether i was doing something wrong or not. what's the harm?
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    (Original post by Zohair09)
    either the book is wrong or you've read something wrong,
    is it MEI? our books from them are awful
    edexcel
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    (Original post by dumb maths student)
    clearly i did do the maths..

    the book gave a different answer to me like 6 times in a row, so i made this thread to see whether i was doing something wrong or not. what's the harm?
    If the book has 6 answers wrong then I think you are looking at the wrong chapter.
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    I get -88 also.

    If the book has 6 answers wrong then I think you are looking at the wrong chapter.
    I wouldn't rule that out at this stage
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    (Original post by dumb maths student)
    the book gave a different answer to me like 6 times in a row
    Are you looking at the right answers? :confused:
 
 
 
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Updated: January 23, 2010
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