Page 1 of 61 1231151 ... LastLast
Results 1 to 25 of 1505
Like Tree404Likes

Thread: Cambridge Prelim MX1 Textbook Marathon/Q&A

  1. #1
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Cambridge Prelim MX1 Textbook Marathon/Q&A

    Though of starting this thread to help preliminary students with their struggle with any maths problems from this book only, especially with the extension questions.

    If you are asking a question, remember to reference which question it is in the book.
    If you are going to post an answer, please show full working out.

    Thanks.

  2. #2
    Senior Member MilkyCat_'s Avatar
    Join Date
    Oct 2014
    HSC
    2016
    Gender
    Female
    Posts
    604
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Maths in Focus lyf

  3. #3
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    I guess I will be the first to ask.

    Does anyone know how to answer question 16 i and k in Exercise 4F. Thanks.

  4. #4
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    FYI I tried to write the question up here, but encountered some difficulties. I guess that means you need the book to help answer. Thanks.

  5. #5
    Loquacious One Drsoccerball's Avatar
    Join Date
    May 2014
    HSC
    2015
    Gender
    Undisclosed
    Posts
    3,664
    Rep Power
    6

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by appleibeats View Post
    FYI I tried to write the question up here, but encountered some difficulties. I guess that means you need the book to help answer. Thanks.
    Post the question and i will answer..

  6. #6
    New Member
    Join Date
    Apr 2014
    HSC
    2015
    Gender
    Male
    Posts
    7
    Rep Power
    4

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Q.16 i)
    (I don't know if I attached the picture correctly, first time posting here).

    ..Ok, apparently 2.4Mb is too big for an attachment, so:
    https://www.dropbox.com/s/nd9aig6szg...21.41.jpg?dl=0
    https://www.dropbox.com/s/kkgcpdaids...22.07.jpg?dl=0
    Last edited by FlyingGullible; 6 Mar 2015 at 7:32 PM.

  7. #7
    Member
    Join Date
    Dec 2014
    HSC
    2016
    Gender
    Male
    Posts
    337
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Here are the questions he was referring to:
    Prove the identities:

    16i.)

    16k.)
    Last edited by Ambility; 6 Mar 2015 at 8:32 PM.

  8. #8
    Cadet
    Join Date
    May 2014
    HSC
    2016
    Gender
    Male
    Location
    Sydney. Australia
    Posts
    76
    Rep Power
    4

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    im having troubles with solving inequations with a variable in the denominator - 3A any help will be greatly appreciated!
    Prelim 2k15

    Maths X1 | Eng Adv | PDHPE | Economics | Business Studies | Physics

    ATAR Aim: 95+

  9. #9
    ~~~~ Miss Cricket ~~~~ enigma_1's Avatar
    Join Date
    Feb 2013
    HSC
    2014
    Gender
    Female
    Location
    Lords
    Posts
    4,300
    Rep Power
    7

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by MilkyCat_ View Post
    Maths in Focus lyf
    Don't use Maths in focus
    Prelim + HSC Tutoring: http://community.boredofstudies.org/...esson-%7C.html

    "My pain may be the reason for somebody's laugh but my laugh must never be the reason for somebody's pain"

    ~ Charlie Chaplin

  10. #10
    ~~~~ Miss Cricket ~~~~ enigma_1's Avatar
    Join Date
    Feb 2013
    HSC
    2014
    Gender
    Female
    Location
    Lords
    Posts
    4,300
    Rep Power
    7

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by barcyy View Post
    im having troubles with solving inequations with a variable in the denominator - 3A any help will be greatly appreciated!
    Do you mean something like the example on page 75?

    If there's a variable inn the denominator, the reason that you have to multiply both sides by the square of the denominator if it has a variable like "x" in it is to ensure that you're multiplying both sides by a positive number (since if you square something, either positive/negative it will always be positive) and hence there will be no need to be confused about whether to switch the inequality sign. Coz you know howif you multiply/divide both sides of an inequality by a negative number, the sign flips yeah? So that's why.

    When you do that, you get like a quadratic/cubic or whatever which you can then factorise. Then you graph it as a parabola/cubic or whatever it may be. (ie if the quadratic is greater than/less than/ greater than or equal to/less than or equal to ZERO. And then you apply the inequality to the graph and determine what the final inequality will be from the graph.
    Last edited by enigma_1; 8 Mar 2015 at 12:41 PM.
    Prelim + HSC Tutoring: http://community.boredofstudies.org/...esson-%7C.html

    "My pain may be the reason for somebody's laugh but my laugh must never be the reason for somebody's pain"

    ~ Charlie Chaplin

  11. #11
    New Member
    Join Date
    Dec 2014
    HSC
    N/A
    Gender
    Male
    Posts
    10
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Oops lol didn't see this thread...
    Well here are a few questions for simple plane geometry. I don't know the 'proper' way of doing these questions and there's no answers to refer to in the back.
    It's from Exercise 8B [Question 12. (a),(b),(c),(d)]
    Attachment 31895

  12. #12
    배고파 WrittenLoveLetters's Avatar
    Join Date
    Nov 2014
    HSC
    2016
    Gender
    Female
    Posts
    1,956
    Rep Power
    4

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by enigma_1 View Post
    Don't use Maths in focus
    School assigns Maths in Focus T___T
    HSC 2015:
    Business Studies

    HSC 2016:
    English Advanced
    Mathematics Advanced // Mathematics Extension I
    Economics
    Physics

    ☑ ATAR Goal: 95+
    ☐ Transfer into Law/Commerce

  13. #13
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Hi, not sure how to go about question 16 from chapter 4J. The question is

    the side of a triangle are n2 + n + 1 , 2n + 1 and n2 - 1, where n>1. Find the largest angle of the triangle.

    ( n2 being --> n squared )

    Thanks.

  14. #14
    Member
    Join Date
    Dec 2014
    HSC
    2016
    Gender
    Male
    Posts
    337
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by Meight View Post
    Oops lol didn't see this thread...
    Well here are a few questions for simple plane geometry. I don't know the 'proper' way of doing these questions and there's no answers to refer to in the back.
    It's from Exercise 8B [Question 12. (a),(b),(c),(d)]
    Attachment 31895
    In my book, question 12 only has an ai, aii, aiii, aiv, av and b. Are you sure your talking about the right question?

  15. #15
    New Member
    Join Date
    Dec 2014
    HSC
    N/A
    Gender
    Male
    Posts
    10
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Oops... it's from the year 12 3 unit cambridge textbook, not the year 11 one.

  16. #16
    New Member
    Join Date
    Aug 2014
    HSC
    2016
    Gender
    Female
    Posts
    19
    Rep Power
    4

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by enigma_1 View Post
    Don't use Maths in focus
    What's wrong with maths in focus?

  17. #17
    Member
    Join Date
    Dec 2014
    HSC
    2016
    Gender
    Male
    Posts
    337
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by happy_turtle View Post
    What's wrong with maths in focus?
    A lot of people say Maths in Focus is too easy for the subject its designed for - that it doesn't challenge students enough. Most of these people say cambridge is a good alternative. I, however, own and use both books and I find that they are both good for separate uses. Maths in Focus is great for introducing you to the concepts and ideas, and it does this so well that it is quite easy to catch up if you have missed a lesson, while cambridge really allows you to develop your skills and apply them to harder, or more abstract problems.

  18. #18
    ~~~~ Miss Cricket ~~~~ enigma_1's Avatar
    Join Date
    Feb 2013
    HSC
    2014
    Gender
    Female
    Location
    Lords
    Posts
    4,300
    Rep Power
    7

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by WrittenLoveLetters View Post
    School assigns Maths in Focus T___T
    Quote Originally Posted by happy_turtle View Post
    What's wrong with maths in focus?
    it's a terrible book. Use Cambridge instead. Make Maths in focus extinct from your lives pls

    ty
    Prelim + HSC Tutoring: http://community.boredofstudies.org/...esson-%7C.html

    "My pain may be the reason for somebody's laugh but my laugh must never be the reason for somebody's pain"

    ~ Charlie Chaplin

  19. #19
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Having troubles with question 15 b from 6A.

    The question is :

    Write as a single fraction, without negative indices, and simplify:

    1 - y^ -1 divided by 1 - y^-2

  20. #20
    Member
    Join Date
    Dec 2014
    HSC
    2016
    Gender
    Male
    Posts
    337
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by appleibeats View Post
    Having troubles with question 15 b from 6A.

    The question is :

    Write as a single fraction, without negative indices, and simplify:

    1 - y^ -1 divided by 1 - y^-2
    Generally with these questions, if you can get as much as possible under a common denominator, then invert and multiply, you should be sweet.


  21. #21
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    The answer to that question in the book says:

    y / y + 1

    I understand your answer, but is the answer in the book right??

  22. #22
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Does anyone know how to answer question 21 from 6A:

    a) if x = 2 ^ 1/3 + 4 ^ 1/3, show that x^3 = 6(1+x)

    b) if x = 1/2 + 1/2root 5, show that x^2 + x^-2 / x - x^-1 = 3

    c) show that pq^-1 - p^-1q / p^2q^-2 - p^-2q^2 = pq/p^2 + q^2


    Thanks for your help.

  23. #23
    Member
    Join Date
    Oct 2012
    HSC
    2016
    Gender
    Male
    Posts
    375
    Rep Power
    5

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Does anyone know how to answer question 21 from 6A:

    a) if x = 2 ^ 1/3 + 4 ^ 1/3, show that x^3 = 6(1+x)

    b) if x = 1/2 + 1/2root 5, show that x^2 + x^-2 / x - x^-1 = 3

    c) show that pq^-1 - p^-1q / p^2q^-2 - p^-2q^2 = pq/p^2 + q^2


    Thanks for your help.

  24. #24
    Member
    Join Date
    Dec 2014
    HSC
    2016
    Gender
    Male
    Posts
    337
    Rep Power
    3

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by appleibeats View Post
    The answer to that question in the book says:

    y / y + 1

    I understand your answer, but is the answer in the book right??
    Oh crap, I didn't simplify fully that's awkward. I'll begin where I left off.


  25. #25
    배고파 WrittenLoveLetters's Avatar
    Join Date
    Nov 2014
    HSC
    2016
    Gender
    Female
    Posts
    1,956
    Rep Power
    4

    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by enigma_1 View Post
    it's a terrible book. Use Cambridge instead. Make Maths in focus extinct from your lives pls

    ty
    I do MIF for class work - even my teacher says its shit, so she gives us hardcore past papers, work from selective schools and uses Cambridge.
    HSC 2015:
    Business Studies

    HSC 2016:
    English Advanced
    Mathematics Advanced // Mathematics Extension I
    Economics
    Physics

    ☑ ATAR Goal: 95+
    ☐ Transfer into Law/Commerce

Page 1 of 61 1231151 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •