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    (Original post by iMacJack)
    Zacken please can you explain the f(k) = 5m or whatever method please very briefly?

    Cheers...
    I don't think I should, it'll just confuse you and it's the night before... stick to the normal method, it works everytime.
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    (Original post by Hot&SpicyChicken)
    When multiplying a matrix by an inverse of another matrix, how do you know what side to put the inverse on, if both matrices are 2x2, this really messes me up??

    PLEASE HELP!!!
    If we have AB = C and we have C and A and need to find B we need to isolate it

    So you put A^-1 to the far left -----> A^-1AB = A^-1C

    This gives B = A^-1C

    The Identity Matrix has to be A^-1A or AA^-1 (i.e. side by side)

    So if you were to do this ----> ABA^-1, the RIGHT would be CA^-1,
    so we CANNOT make AA^-1 into I as they are not side by side.

    So bear in mind that ABA^-1 =/= A^-1AB

    Sorry if it's badly explained, hope it helps
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    (Original post by connorbarr)
    If this helps

    Oh ok that is very helpful thank you very much!
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    https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

    Can someone please check, surely question 8)(c) is wrong, and it should be the normal?
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    (Original post by Zacken)
    I don't think I should, it'll just confuse you and it's the night before... stick to the normal method, it works everytime.
    But I was unable to get the one in the IAL 2015 paper using it.
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    (Original post by connorbarr)
    This one? This is from my notebook when i did the paper
    Thank you very much! I understand it now.

    Also can I commend you on your incredibly neat notes
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    (Original post by iMacJack)
    But I was unable to get the one in the IAL 2015 paper using it.
    It's perfectly do-able using it.
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    Going to sleep now, good luck everyone.
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    Well that is me off so good luck to everyone Hope all goes well for you in this exam and all the others

    signing out.
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    (Original post by alfmeister)
    Going to sleep now, good luck everyone.
    (Original post by Music With Rocks)
    Well that is me off so good luck to everyone Hope all goes well for you in this exam and all the others

    signing out.
    Good luck.
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    (Original post by iBall)
    Is this method fine for proof divisibility? (didn't complete the q in its entirety i know..)
    Yup I think it should be fine i got the exact same answer but instead of 20A i got 4f(k) which is exactly the same thing
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    (Original post by Zacken)
    It's perfectly do-able using it.
    yeah i know haha I just wasn't able to personally
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    (Original post by iMacJack)
    yeah i know haha I just wasn't able to personally
    It'll be fine tomorrow, just get some sleep.
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    (Original post by Zacken)
    Good luck.
    https://7cba9babeb0db0ff9468853e0b2d...% 20Edexcel.pdf

    Can you please check, surely question 8)(c) is wrong, and it should be the normal? not the tangent?
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    (Original post by Hot&SpicyChicken)
    https://7cba9babeb0db0ff9468853e0b2d...% 20Edexcel.pdf

    Can you please check, surely question 8)(c) is wrong, and it should be the normal? not the tangent?
    Seems fine to me, what's the problem?
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    (Original post by Zacken)
    Seems fine to me, what's the problem?
    For wuestion 8) (c) it is impossible for the tangent to meet the curve again, bu the normal does, so i think the question is wrong?
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    (Original post by Hot&SpicyChicken)
    For wuestion 8) (c) it is impossible for the tangent to meet the curve again, bu the normal does, so i think the question is wrong?
    https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

    Even the mark scheme uses the normal? Am i correct or just liost?
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    Hey could someone please link/ send me some hard proofs by induction for each of the proofs mentioned on the spec
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    (Original post by Hot&SpicyChicken)
    https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

    Even the mark scheme uses the normal? Am i correct or just liost?
    Haven't done the question but it is possible for the tangent to meet and xy graph again i think
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    (Original post by Hot&SpicyChicken)
    https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

    Even the mark scheme uses the normal? Am i correct or just liost?
    Don't worry that's a typo, I got stuck on it too. The tangent doesn't ever meet the curve again, which actually checks out as if you equate the tangent at that point to the curve, you get (x-6)^2 = 0
 
 
 
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