Mathematics: Post your doubts here!

[Thought blocker]

http://maxpapers.com/category/qualifications/international/cambridge/a-level/a-level-physics-9702/ i found this site

I want Examiner report

 

[Thought blocker]

lol as she said this isn't that high

Are you done with your M1 ?

 

[Faaiz Haque]

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s06_qp_1.pdf

Q4

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s06_qp_1.pdf

Q4

By using binomial expansion of (A + B)^n = (nC0)(A^n)(B^0) + (nC1)(A^(n-1))(B^1)+ ....... + (nCn)(A^0)(B^n) {where xCy = (x!)/(y!)(x-y)!}
Putting the corresponding values of A and B as 2 and ax respectively we get,
(2 + ax)^n = (nC0)(2^n)(ax)^0 + (nC1)(2^(n-1))(ax)^1+ (nC2)(2^(n-2))(ax)^2 +....... + (nCn)(2^0)(ax)^n
(2 + ax)^n = (2^n) + (a.x.n)(2^(n-1))+ n(n-1)(2^(n-2))(ax)^2 +.......
From the given equation we get, 2^n = 32 -> n = 5
and (a.x.n)(2^(n-1)) = -40x
-> 5.a.2^4 = -40
-> a = -0.5
and n(n-1)(2^(n-2))(ax)^2 = bx^2
-> 5.4.2^3.(0.25)x^2 = bx^2
-> b = 40
hence we get, n = 5, a = -0.5 and b = 40

 

[Namehere]

lol as she said this isn't that high

Nah, I´m doing both AS and A2 this summer.

 

[Thought blocker]

Nah, I´m doing both AS and A2 this summer.

All the best.

 

[Namehere]

PLEASEEEEEEEEE! NOONE IS ANSWERING ME THIS QUESTION AND I REALLY NEED AN EXPLANATION FOR IT (HENCE THE CAPS).
Its about complex numbers, Q8(b). I get the diagram part, but dont know how to find the least value.

Here i attach the question paper and marking scheme:

Thank you in advance!

 

[Thought blocker]

 

[ZaqZainab]

Are you done with your M1 ?

i don't take Mechanics i take Statistics

 

[Thought blocker]

i don't take Mechanics i take Statistics

I thought M1 will be easy

 

[ZaqZainab]

I thought M1 will be easy

its easy when you take physics
but me right here statistics mostly different

 

[Thought blocker]

its easy when you take physics
but me right here statistics mostly different

Nvm.

 

[Thought blocker]

View attachment 39007

??

 

[immie.rose]

 

[Namehere]

View attachment 39010

looks like someone is having trouble with the same paper as me... If you know how to do Q8(b) from that paper please let me know!

 

[immie.rose]

looks like someone is having trouble with the same paper as me... If you know how to do Q8(b) from that paper please let me know!

This is as far as i could get, with the help of my teacher. its kinda blur tho, sorry.

 

[Namehere]

This is as far as i could get, with the help of my teacher. its kinda blur tho, sorry.

But thats no the correct answer, plus its not the least value :S

 

[Namehere]

Btw, do you know where I can find winter 2013 examiner reports?

 

[ZaqZainab]

Btw, do you know where I can find winter 2013 examiner reports?

http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_w13_er/

 

[Namehere]

http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_w13_er/

ZaqZainab, do you know how to do that question (8b from Oct/Nov 2013 Paper 32)?