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Maths!

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245

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    #32
    Mimikyu
    Registered Users Posts: 18,916 ✭✭✭✭Mimikyu


    This post has been deleted.


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    #33
    Hugh Hefner
    Closed Accounts Posts: 2,767 ✭✭✭Hugh Hefner


    Solitaryman666 wrote:
    This post has been deleted.
    Eh, 2x-3y = 9 (to be mulitplied by 2) = 4x-6y = 18 not 4x+6y = 18.

    You got it right cos' you kinda just added -15x and 4x and wrote 19x instead of -11x (the correct answer) and you added -39 and 18 and put down 57 whereas the actually answer for that would be -21.

    Hugh Hefner resident party pooper. :D


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    #34
    Nietzschean
    Registered Users Posts: 7,314 ✭✭✭Nietzschean


    Hugh Hefner wrote:
    The way I do them is (using 666's example):-
    ...
    Well you could always use the matrix methods too its much clearer, but i doubt on the JC course..


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    #35
    Hugh Hefner
    Closed Accounts Posts: 2,767 ✭✭✭Hugh Hefner


    Darth Bobo wrote:
    the matrix methods
    I've not even heard of them.


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    #36
    Mysteryfish
    Closed Accounts Posts: 315 ✭✭Mysteryfish


    the way hugh hefner did it is the way i woul, but there is so much confusion with all the methods...


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    #37
    Hugh Hefner
    Closed Accounts Posts: 2,767 ✭✭✭Hugh Hefner


    Are you talking about the higher level similtaneous equations question today? Cos' it messed up of me. I got the answers and then I tested if they would work in the other equation but they didn't. b was 5, I think, and c was -14 in one equation and 6/-6 in the other (I think :confused:).


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    #38
    Mysteryfish
    Closed Accounts Posts: 315 ✭✭Mysteryfish


    i can't remember what the answers were, but my sim. equa. all worked out for me in the exam. There was so many bloody surds 3rd roots that when i got to sim. equa. it was such a nice breather.


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    #39
    Big Ears
    Registered Users Posts: 8,968 ✭✭✭Big Ears


    I did pass Maths , not that im not able for Hounours but because im too lazy to study enough for it . I beleive I got every question 100% right :) , so im on my way to an A .


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    #40
    philologos
    Closed Accounts Posts: 22,479 ✭✭✭✭philologos


    Hugh Hefner wrote:
    Are you talking about the higher level similtaneous equations question today? Cos' it messed up of me. I got the answers and then I tested if they would work in the other equation but they didn't. b was 5, I think, and c was -14 in one equation and 6/-6 in the other (I think :confused:).
    y was 14
    x was 31
    i think i might had got signs wrong


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    #41
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    I got B as 6 and C as -5 if I can recall correctly.
    There were a couple of simultaneous equations, though.


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    #42
    Flashling
    Closed Accounts Posts: 779 ✭✭✭Flashling


    b was 1 and c was -6. Worked out perfectly for me, but now you're making me doubt myself....


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    #43
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Okay just did it again a second ago and I got that.
    I can't remember if I got the same in the exam though.... dayamn. Whatever it was I couldn't do the second part of that question anyway. Damn functions.


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    #44
    Fobia
    Registered Users Posts: 1,958 ✭✭✭Fobia


    There were simultaneous equations in that exam?!!1 ;)

    That paper was alot harder than previous papers methinks, but I did alright, definitely a B...possibly an A, didn't manage to finish 2 C's so I hope the attempt marks will keep me up high..

    One thing that my whole year didn't know was wtf a reciprocal was, apparently it's in the log tables but I didn't know and as such didn't bother to look (didn't open them the whole exam..), odd that they changed alot of the layout this year though. Alot more surds questions and several of those extremely annoying and hard "express my coffee in terms of x" questions.

    Off to install my new Dvd-rw, screw irish paper 2 :)


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    #45
    Furze
    Registered Users Posts: 31 ✭Furze


    Anyone figure out Q. 3 (c) - the drinking choc question ?


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    #46
    Fenny
    Registered Users Posts: 122 ✭✭Fenny


    ^ That turned out to be a quadratic equation, didn't it? I tried and I tried and I tried, but I kept getting x2 + 30x + 108 = 0
    (um, that's supposed to be a squared)
    I could not for the life of me find factors for 108, so I just left it. The attempt marks shall keep me buoyed, and after talking to a few others, they seemed to get into that rut too - though someone said it worked out and they had 150, so I'm not sure what the right answer is.


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    #47
    modular
    Closed Accounts Posts: 310 ✭✭modular


    Furze wrote:
    Anyone figure out Q. 3 (c) - the drinking choc question ?

    I got 90g @ 4c per gram in normal time.
    120g @ 3c per gram in promotion time.


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    #48
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Holy christ you almost gave me a heartattack there modular. I only found out how many grammes there were (got the same figures though). Checked the papers. Didn't have to find out how much it was per gram. Phew.

    And I couldn't have been bothered to find the factors for it, so I just used the quadratic formula. Heh, whenever I got stuck in that exam I just started using that formula. Even in the functions questions...

    There is a section on recipricols in the log tables (I was finished, started reading log tables to try learn some Irish) but it's for logarithms and doesn't actually say anything helpful about what recipricols actually are.


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    #49
    modular
    Closed Accounts Posts: 310 ✭✭modular


    I managed to use the log tables to help me in the reciprocal question. I thought it might have been the fraction upside-down, so when I looked up the reciprocal of 35, and it looked like 2/7 in decimals, I pretty much knew I was right.


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    #50
    Furze
    Registered Users Posts: 31 ✭Furze


    modular wrote:
    I got 90g @ 4c per gram in normal time.
    120g @ 3c per gram in promotion time.

    Fenny,
    Did the exact same, maybe my scribbles will count for something !

    Modular,
    If u get a spare couple of hours; can you post the solution ? :confused:


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    #51
    Hugh Hefner
    Closed Accounts Posts: 2,767 ✭✭✭Hugh Hefner


    Oh God! I got like 11100 grams! The more I think about that test the worse I think I did. Boohoohoo! I'm seriously worried about my A now!


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    #52
    Irishstabber
    Registered Users Posts: 549 ✭✭✭Irishstabber


    Same. I think I said there was 60 grams in it :( ...I'll just have to do great on paper 2. Easy paper, wont be hard at all...unless they do another paper 1 job. Does anyone agree it was one of the hardest papers if you take into account the 2004-3 and sample papers???...I think it was a hard year. Easy on English but give us a hard maths :mad:


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    #53
    Diarmsquid
    Registered Users Posts: 1,584 ✭✭✭Diarmsquid


    I got 11 grammes the first time.
    Then i thought €3.60 for 11 grammes? I wouldn't buy that! Even if it was on sale!

    Then i did it again and got it right like yer man said above. :D


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    #54
    Irishstabber
    Registered Users Posts: 549 ✭✭✭Irishstabber


    Havefun....

    http://www.leavingcertsolutions.com/maths05/2005_Junior_Cert_Higher_Maths_Paper_1.pdf

    I totally F**cked up.


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    #55
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Wow, I didn't screw up as bad on Q6 as I thought. ... sort of.


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    #56
    Hugh Hefner
    Closed Accounts Posts: 2,767 ✭✭✭Hugh Hefner


    Awwwwww! I made loads of bloody mistakes! I feel really crappy now. Any other exam and I wouldn't really care but Maths just pains me to do badly in. I really have to get a full score in Paper 2 now. C'mon the A!


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    #57
    Fenny
    Registered Users Posts: 122 ✭✭Fenny


    Damn ... I got a few things I was sure I had right wrong. I didn't screw up Q. 4 as I had thought. The problem is Paper 1 is my best one - I'm ****ed on Paper 2!


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    #58
    Big Ears
    Registered Users Posts: 8,968 ✭✭✭Big Ears


    Irishstabber wrote:
    Havefun....

    http://www.leavingcertsolutions.com/maths05/2005_Junior_Cert_Higher_Maths_Paper_1.pdf

    I totally F**cked up.

    You got a page for the ordinary ones ?


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    #59
    Irishstabber
    Registered Users Posts: 549 ✭✭✭Irishstabber


    Na I didnt see them on the site...they have LC ordinary so i suppose after getting through the long JC ORD paper they will put it up.


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    #60
    Victor
    Registered Users Posts: 78,375 ✭✭✭✭Victor


    Solitaryman666 wrote:
    This post has been deleted.

    Alternative solution.


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    #61
    Alqua
    Registered Users Posts: 298 ✭✭Alqua


    Wish I hadn't looked at those solutions now! :p A lot of the questions that I was so happy to have got out seem to be wrong. Those simultaneous equations especially.


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