Page 7 of 7 FirstFirst ... 567
Results 151 to 168 of 168
Like Tree16Likes

Thread: Cambridge HSC MX1 Textbook Marathon/Q&A

  1. #151
    Cadet
    Join Date
    Jun 2016
    HSC
    2019
    Gender
    Male
    Location
    WA
    Posts
    72
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Isn't the formula this?

    For the number of ways to arrange n objects taken r at at a time

    n!/(n-r)!

    So it would be

    7!/(7-4)! = 7!/3! = 7*6*5*4*3!/3! = 7*6*5*4=840

    But since we have 2 c's and 2 o's, the answer would be 840/2!2! = 840/4 =210
    Last edited by Mongoose528; 3 Aug 2016 at 10:03 AM.

  2. #152
    Executive Member
    Join Date
    Jul 2014
    HSC
    2017
    Gender
    Female
    Location
    SYD
    Posts
    1,731
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by Mongose528 View Post
    Isn't the formula this?

    For the number of ways to arrange n objects taken r at at a time

    n!/(n-r)!

    So it would be

    7!/(7-4)! = 7!/3! = 7*6*5*4*3!/3! = 7*6*5*4=840

    But since we have 2 c's and 2 o's, the answer would be 840/2!2! = 840/4 =210
    Wrong, you would need to take it by cases or Pork's Insertion Method

  3. #153
    Ancient Orator
    Join Date
    Nov 2015
    HSC
    N/A
    Gender
    Undisclosed
    Location
    Space
    Posts
    4,179
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    How do I do this


  4. #154
    Ancient Orator
    Join Date
    Nov 2015
    HSC
    N/A
    Gender
    Undisclosed
    Location
    Space
    Posts
    4,179
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Also


  5. #155
    New Member
    Join Date
    Sep 2016
    HSC
    2017
    Gender
    Female
    Posts
    1
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    help.png

    anyone who can help me with question 12b and 13a of exercise 4F?

  6. #156
    Loquacious One
    Join Date
    Feb 2009
    HSC
    N/A
    Gender
    Male
    Posts
    3,690
    Rep Power
    9

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Last edited by Drongoski; 27 Sep 2016 at 11:02 PM.
    1-on-1 Maths Tutoring(IB & HSC): Epping, Beecroft, Eastwood, Carlingford & Beyond
    IB: Maths Studies, Maths SL & Maths HL; HSC: 2U, 3U & 4U
    Highly Qualified & Highly Experienced. Estimated ATAR > 9.995
    There are IB Maths Tutors and there are IB Maths Tutors.

  7. #157
    Junior Member kashkow's Avatar
    Join Date
    Oct 2015
    HSC
    2016
    Gender
    Male
    Location
    Right here.
    Posts
    177
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by infiniteeee View Post
    help.png

    anyone who can help me with question 12b and 13a of exercise 4F?
    The first question:

    The "sum of the products of pairs of roots" refers to the x term which is absent, meaning the coefficient is 0. Therefore the "sum of the products of pairs of roots" = 0

    Algebraically: ab + a(a+b) + b(a+b) = 0 [... a = alpha, b = beta]

    Expanding: ab + a^2 + ab + ab + b^2 = 0

    ab + a^2 + 2ab + b^2 = 0

    Combining the perfect square:

    ab + (a+b)^2 = 0

    And you can use the results from the question before 12a what (a+b)^2 is.

    That is substitute (a+b) = 1/2*A = A/2

    ab + (A/2)^2 = 0

    ab + (A^2)/4 = 0

    Therefore: ab = -(A^2)/4 = -1/4 * A^2

    Sorry if it's hard to read. Rats i was late again... :P
    ^ This is the result if you have too much time on your hands + procrastination... ^

  8. #158
    -insert title here- Paradoxica's Avatar
    Join Date
    Jun 2014
    HSC
    2016
    Gender
    Male
    Location
    Outside reality
    Posts
    2,434
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by eyeseeyou View Post
    Also

    Cosine Rule XOR Sine Rule
    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

  9. #159
    -insert title here- Paradoxica's Avatar
    Join Date
    Jun 2014
    HSC
    2016
    Gender
    Male
    Location
    Outside reality
    Posts
    2,434
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by eyeseeyou View Post
    How do I do this

    ...seriously just draw a diagram
    If I am a conic section, then my e = ∞

    Just so we don't have this discussion in the future, my definition of the natural numbers includes 0.

  10. #160
    Executive Member
    Join Date
    Jun 2014
    HSC
    N/A
    Gender
    Male
    Location
    Sydney, New South Wales
    Posts
    1,885
    Rep Power
    4

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by infiniteeee View Post
    help.png

    anyone who can help me with question 12b and 13a of exercise 4F?
    EX 4F Q13 a









































    eyeseeyou likes this.
    | B Eng (Hons) | IB Mathematics SL | IB Mathematics HL | Australian Cricket | Casual University Statistics Tutor

  11. #161
    Cadet 123ryoma12's Avatar
    Join Date
    Apr 2015
    HSC
    2016
    Gender
    Male
    Posts
    86
    Rep Power
    3

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Capture.PNG
    Attached Images Attached Images

  12. #162
    Rambling Spirit
    Join Date
    Dec 2014
    HSC
    N/A
    Gender
    Male
    Posts
    6,037
    Rep Power
    7

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by 123ryoma12 View Post


    Last edited by InteGrand; 30 Sep 2016 at 4:38 PM.

  13. #163
    New Member
    Join Date
    Mar 2016
    HSC
    N/A
    Gender
    Female
    Posts
    1
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    Hi, is anyone able to do question 17 d from exercise 10E ?
    Thank you!
    Capture.PNG

  14. #164
    New Member
    Join Date
    Sep 2016
    HSC
    2016
    Gender
    Undisclosed
    Posts
    19
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    If N is to the left of U, the answers must all be in the form ____N____U____, where the underscores represent places the remaining four letters can go. So:
    Consider _N_U_, where we are trying to insert M. There are 3 places for it to go.
    Now consider what will be left, we have: _N_U_M_, or _N_M_U_, or _M_N_U_. Regradless of where we place the M, there are four places for the next letter.
    Following this, wherever we place the next letter will take away one available space, but create two either side of it, netting one more. So for M there are 3, for B there are 4, for E there are 5, and for R there are 6.
    Doing it this way gives an answer of 3*4*5*6=360, and with this method we cover the event of placing the letters down in different orders.

  15. #165
    Junior Member aycaramba's Avatar
    Join Date
    Aug 2015
    HSC
    N/A
    Gender
    Female
    Posts
    126
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    http://prnt.sc/dfvluh pls halp. what does this ques mean

  16. #166
    New Member
    Join Date
    Sep 2016
    HSC
    2016
    Gender
    Undisclosed
    Posts
    19
    Rep Power
    2

    Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread

    It's asking what values of a, b, and c are required to change the degree of the polynomial. For example, if you had a polynomial , and you wanted a polynomial of degree 1, a and b would both have to be zero, so that the polynomial became , with the degree of a polynomial being the highest exponent.

  17. #167
    New Member
    Join Date
    Jun 2017
    HSC
    2018
    Gender
    Male
    Posts
    1
    Rep Power
    1

    Re: Cambridge HSC MX1 Textbook Marathon/Q&A

    Can anyone help me question 23 of Exercise 1 E

  18. #168
    Loquacious One
    Join Date
    Feb 2009
    HSC
    N/A
    Gender
    Male
    Posts
    3,690
    Rep Power
    9

    Re: Cambridge HSC MX1 Textbook Marathon/Q&A

    Quote Originally Posted by sleepywood View Post
    Can anyone help me question 23 of Exercise 1 E
    Yr 11 or Yr 12 text? Edition? Is it the one involving y = sin-1 x ??
    Last edited by Drongoski; 26 Dec 2017 at 8:14 AM.
    1-on-1 Maths Tutoring(IB & HSC): Epping, Beecroft, Eastwood, Carlingford & Beyond
    IB: Maths Studies, Maths SL & Maths HL; HSC: 2U, 3U & 4U
    Highly Qualified & Highly Experienced. Estimated ATAR > 9.995
    There are IB Maths Tutors and there are IB Maths Tutors.

Page 7 of 7 FirstFirst ... 567

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
  •