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    http://store.aqa.org.uk/qual/pdf/AQA-MFP4-TEXTBOOK.PDF

    On page 67, exercise 4b, question 6.

    It says:

    Four points are given by A(1,-2,0), B(3,-3,-1), C(2,3,-1) and D(3,4,-5)

    a) Calculate ABxCD.

    I got (5,7,3). In their answers it says 3i + 9j + 3k.

    I don't know how they got that. Can someone explain please?
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    (Original post by GeneralOJB)
    I got (5,7,3). In their answers it says 3i + 9j + 3k.

    I don't know how they got that. Can someone explain please?
    Book's wrong. I agree with your answer.

    Last post for today.
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    ****, these AQA textbooks are ****. I'm in lower sixth and I'm doing further maths, I'm doing C3/C4/D2/FP1/FP4 this june. I've had to self teach FP1 and FP4 with these crappy printed out textbooks they've given me which are full of mistakes. FWEFUIEOIFJF
 
 
 
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