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Thread: Cambridge Prelim MX1 Textbook Marathon/Q&A

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

    Anyone know how to do 12B Question 16? thanks.

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

    Quote Originally Posted by lypoon View Post
    Anyone know how to do 12B Question 16? thanks.
    Post it up, not everyone has the book.
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    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by lypoon View Post
    Anyone know how to do 12B Question 16? thanks.
    I believe that is the question you are referring to:
    Screen Shot 2016-11-25 at 7.34.44 pm.png
    a)


    implies


    b)

    implies

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

    Can someone please help me with this question?
    Exercise 6J q11b

    Every two hours, half of a particular medical isotope decays. If there was originally 20g, how much remains after a day (to two significant figures)?

    Thanks!

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

    Quote Originally Posted by studyingg View Post
    Can someone please help me with this question?
    Exercise 6J q11b

    Every two hours, half of a particular medical isotope decays. If there was originally 20g, how much remains after a day (to two significant figures)?

    Thanks!
    “Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
    ― Brandon Mull

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

    Hi ! could someone lease help with these questions:

    9
    10c
    11a

    thanks heaps!

    [ATTACH]IMG_7175 (2).JPG[/ATTACH]

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

    Does anyone have the answer (and preferably the logic) to 7B Q15? Thanks

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

    @books: Here is q9. Try to attempt the other questions again. http://imgur.com/KNGlrhH

    @iso: https://imgur.com/a/4kQbG

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

    Hi I was just wondering where would the best and most useful content be within the book?? Like the 1st excercises are too much a waste of time, which chapters cover the most worth-wile course content??

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

    Quote Originally Posted by Raiza_98 View Post
    Hi I was just wondering where would the best and most useful content be within the book?? Like the 1st excercises are too much a waste of time, which chapters cover the most worth-wile course content??
    Do the series and sequences (you don't really need a teacher to understand it), try the calculus (chapter 7) and the trig in chapter 4
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    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Has anyone done 8I Q7
    a) (p+q+x)(pq+px+qx)-pqx=(p+q)(p+x)(q+x) and the rest b,c,d
    do they want me to expand everything or is there an easier way?
    thankyou

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

    EX 9A Q 12, I've seen the first stage in writing the answer as :



    Part of the reason I've seen is that 'P must above the x-axis'

    I'm not sure why they add the 'y' to it still? It has got me thinking for the last couple of hours. Is there a better way to understand this visually?
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    Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

    Quote Originally Posted by davidgoes4wce View Post
    EX 9A Q 12, I've seen the first stage in writing the answer as :



    Part of the reason I've seen is that 'P must above the x-axis'

    I'm not sure why they add the 'y' to it still? It has got me thinking for the last couple of hours. Is there a better way to understand this visually?
    What is the question (don't have a copy of the textbook nearby)?

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

    Quote Originally Posted by InteGrand View Post
    What is the question (don't have a copy of the textbook nearby)?
    I think it might be this one:

    Find the locus of a point P(x, y) which lies above the x-axis so that the sum of its distances to the origin and the x-axis is 2.

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

    Quote Originally Posted by boredofstudiesuser1 View Post
    I think it might be this one:

    Find the locus of a point P(x, y) which lies above the x-axis so that the sum of its distances to the origin and the x-axis is 2.

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

    Need help with question 3(allparts) of 10E please

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

    Quote Originally Posted by a_t View Post
    Need help with question 3(allparts) of 10E please
    Should try to include the actual question. Not everyone willing to help you has the book. I have the older 3U Yr 11 - the Chapters and exercise numberings may have changed.
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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Help with Question 11 Exercise 2J
    For those without the book: Determine how the curve y = x^3 - x must be transformed in order to obtain the graph of y = x^3 - 3x. {hint: only stretchings are involved}
    Full worked solutions would appreciated.
    Cheers

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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Quote Originally Posted by Pakka View Post
    Help with Question 11 Exercise 2J
    For those without the book: Determine how the curve y = x^3 - x must be transformed in order to obtain the graph of y = x^3 - 3x. {hint: only stretchings are involved}
    Full worked solutions would appreciated.
    Cheers
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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Thank you

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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    guys I'm in need of some help with [

    ]simplify
    a)1+tan^2(90degrees- θ )
    prove
    b)cot θ cos θ/cot θ +cos θ=cos θ /1+sin θ

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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Last edited by Drongoski; 6 May 2017 at 1:46 PM.
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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Quote Originally Posted by Thatstudentm9 View Post
    guys I'm in need of some help with [

    ]simplify
    a)1+tan^2(90degrees- θ )
    prove
    b)cot θ cos θ/(cot θ +cos θ)=cos θ /(1+sin θ)
    Should be amended as shown; otherwise it shows you don't know your algebra or you are being careless and/or sloppy.
    Last edited by Drongoski; 6 May 2017 at 1:43 PM.
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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A



    Can someone please help me with Question 12.

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    Re: Cambridge Prelim MX1 Textbook Marathon/Q&A

    Quote Originally Posted by z3bra View Post


    Can someone please help me with Question 12.




















    Mahan Ghobadi

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