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AQA c4 vectors

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    • Thread Starter

    Hi, i have done every single exercise on vectors in the core 4 book, that I have and another one, yet i cant get my head round some of the exam questions on vectors, its like i see something that i genuinely havent learned? Can anyone suggest any ideas, of exercises that i can do to help me with it?

    Why not post an example of the ones you find difficult.
    • Thread Starter

    (Original post by nerak99)
    Why not post an example of the ones you find difficult.
    its literally the last part of every exam question, on vectors, so i can do the first 8 marks, and the last 4-5 i struggle with ill post an example http://filestore.aqa.org.uk/subjects...W-QP-JAN11.PDF

    the last question on the paper, that last bit the 6 marker on vectors with trapeziums.

    OK. here is a tip or two. As you probably know, later questions tend to be harder. You will almost always need material from early in a Q to answer later parts. ALL the information in a question is their for a purpose.

    In vector questions, later parts will involve identifying a point by a pair of SEs or a quadratic in a parameter. In this case you know l1 early on and you can find D. This allows you to find l2 because you know you can use AB as a direction vector since it is parallel to DC.

    You then find BC as a vector and also use the length of BC equalling the length of AD to set up a quadratic in the special value of mu that isolates C.

    Each board has a trick to the kind of extra bits on Qs. Edexcel likes to use different tricks to OCR and they are different to AQA. When doing these question I suggest that you line up (say) 6 vector Qs all from AQA. Look and understand the alternative answers in the mark scheme and write out the solutions to the whole question from memory in each form.

    These harder Qs will almost always have alternative solutions.

    If you can't understand a particular solution then ask here. These later questions demand a bit of insight each time. Usually fairly straightforward ideas from geometry but applied in a context of vectors. The idea is to distinguish good candidates from very good candidates and so this is bound to be hard.
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