# Cambridge Prelim MX1 Textbook Marathon/Q&A (1 Viewer)

#### bookss12

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

Hi ! could someone lease help with these questions:

9
10c
11a

thanks heaps!

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#### iso1234

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

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

#### envlam

##### Member
• donkily

#### aroon

##### New Member
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??
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

#### vickyera

##### New Member
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 #### davidgoes4wce

##### Well-Known Member
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?

#### InteGrand

##### Well-Known Member
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?
What is the question (don't have a copy of the textbook nearby)?

#### boredofstudiesuser1

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

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.

• InteGrand

#### InteGrand

##### Well-Known Member
Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

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.

#### a_t

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

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

#### Drongoski

##### Well-Known Member
Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

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.

#### Pakka

##### New Member
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

#### InteGrand

##### Well-Known Member
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

• kawaiipotato

Thank you

#### Thatstudentm9

##### Member
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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#### Drongoski

##### Well-Known Member
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.

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#### z3bra

##### New Member Can someone please help me with Question 12.

#### Mahan1

##### Member Can someone please help me with Question 12.

#### a_t

##### New Member
Need help with this please. Q2A of Ex 7B
For each function below, simplify f(x + h) − f(x) / h , then take lim h→0 to find the derivative.

(a) f(x) = 5x + 1