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    Hey guys just got out of the exam thought it was quite difficult unfortunatly....especially the properties of polynomial roots question and the method of differences one on the last page
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    I found the method of differences question really hard too! I could not see the cancelling out from the terms. Never seen a method of differences like this before.:mad:
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    I ended up getting it from 2 + (1/3) + (2/3) - (3/2) to get the 3/2 bit then the n terms come from the end of the formula but yer I found that question very hard.

    Also couldnt see where the 6n came from in the series question for ages, in the end just added an n to the end of the 6 and everything thing worked out fine but I now realise why it goes there; just wish I could have 2 hours ago :mad:
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    any guesses for grade boundaries?
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    I found the exam reasonable except for the very last question. We were never taught how to actually find answers for notations such as that one. What I did though was to swap r as 50 into (4+r)/r(r+1)(r+2) and I then took away 3/2 - 2/r+1 + 1/r+2

    Is this the right method?

    Also for the question about investigating if 42 + 46j (?) is within the region of the graph, did you guys do, 46j - 2j and 42 - 1 and then find the angle of the triangle?
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    I'm unsure about the method for question 9iii, all I know is I didn't do it

    In the investigation question I simply took the argument of 42+46j and seen if it fit into the range of angles required, maybe I should have taken the modulus aswell , but in the end I came to the conclusion that it did fall into the range
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    (Original post by speedystef)
    I ended up getting it from 2 + (1/3) + (2/3) - (3/2) to get the 3/2 bit then the n terms come from the end of the formula but yer I found that question very hard.

    Also couldnt see where the 6n came from in the series question for ages, in the end just added an n to the end of the 6 and everything thing worked out fine but I now realise why it goes there; just wish I could have 2 hours ago :mad:
    Is that the one using the standard formulae?
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    So did I, but I am not sure if my method is correct or not. Finding the modulus definitely wasn't required.
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    What did you guys get as the inequality of the two circles?
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    (Original post by JBKProductions)
    Is that the one using the standard formulae?

    Yer I was refering to the standard formulae one at the end with 6n etc.
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    (Original post by speedystef)
    Yer I was refering to the standard formulae one at the end with 6n etc.
    Ah yeah that one confused me a bit too with +6 but then i realised it was 6n just in time when i was going back to check my answers.
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    That's exactly what I did, I just hope they don't take marks off because i didn't have +6n at the start of the question.

    Btw did you get something really strange for d in the polynomial question like root7/2?
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    (Original post by Summerdays)
    What did you guys get as the inequality of the two circles?
    I cant remember the centre of the circle but i got |z-(a+bj)|>1 for the smaller circle and |z-(c+dj)|< 3 (or whatever the radius was...)
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    In the polynomial question i got a =1 k=11 and d=0.5 but i could be wrong.:p:
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    I thought that it said that it was between the two circles, but not including (both) the boundary circles?
    I think you might be right though. I got |z-(a+bj)|<1 and |z-(c+dj)|<4


    I found the exam reasonable except for the very last question. We were never taught how to actually find answers for notations such as that one. What I did though was to swap r as 50 into (4+r)/r(r+1)(r+2) and I then took away 3/2 - 2/r+1 + 1/r+2?
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    (Original post by JBKProductions)
    In the polynomial question i got a =1 k=11 and d=0.5 but i could be wrong.:p:
    I believe d was +-0.5, but it didn't matter because you would still get the right answer. I got the same value for a and K
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    (Original post by Summerdays)
    I thought that it said that it was between the two circles, but not including (both) the boundary circles?
    I think you might be right though. I got |z-(a+bj)|<1 and |z-(c+dj)|<4


    I found the exam reasonable except for the very last question. We were never taught how to actually find answers for notations such as that one. What I did though was to swap r as 50 into (4+r)/r(r+1)(r+2) and I then took away 3/2 - 2/r+1 + 1/r+2?
    Yeah same. We havent been taught about things in question 9 much too.
    EDIT: For the circles question, it was between the two boundaries so its >1 since its everything outside on the inner circle.
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    The investigation for the complex number being in the shaded region, what method di you use? Did you use the method I described earlier?
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    I found it quite straight forward up to the method of differences which I worked out in the end. I definitely made some silly mistakes though. I was lucky actually as all the revision I'd done was a couple of exam papers yesterday (resitting) and everything that came up was similar to that.

    For the last question did anyone just sub values of r = 50 and r=100 in and then take one from the other?
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    I wasn't sure about that part of the complex number question. We haven't done anything like that before so i just skipped it...
 
 
 
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