Mathematics: Post your doubts here!

[R_Ma7mooD]

guys in finding dx/dy of y= 12/3-2x
I got an answer of 24/4x^2-12x+9
and the marking scheme shows -12(3-2x)^-2*-2
both give the same answer but will my answer be counted?

 

[The Sarcastic Retard]

guys in finding dx/dy of y= 12/3-2x
I got an answer of 24/4x^2-12x+9
and the marking scheme shows -12(3-2x)^-2*-2
both give the same answer but will my answer be counted?

Ya.

 

[Ram97]

guys in finding dx/dy of y= 12/3-2x
I got an answer of 24/4x^2-12x+9
and the marking scheme shows -12(3-2x)^-2*-2
both give the same answer but will my answer be counted?

You have expanded your answer while the ms hasn't
Yes you're answer will be counted but its better to leave your answer simplified

 

[asadalam]

Why is the ans -√x+2 and not the positive root?

 

[The Sarcastic Retard]

Why is the ans -√x+2 and not the positive root?
View attachment 52990

Which year?

 

[Fahm Deen]

Can someone upload a solution to May/June 2014 P-33 Q.7 b(ii).

 

[R_Ma7mooD]

Ya.

You have expanded your answer while the ms hasn't
Yes you're answer will be counted but its better to leave your answer simplified

alright thanks guys

 

[papajohn]

Q:11 iii Please

http://maxpapers.com/wp-content/uploads/2012/11/9709_w14_qp_12.pdf

 

[BhaiArshad]

Why is the ans -√x+2 and not the positive root?
View attachment 52990

Which year?

It's 9280 Math Specimen Paper 1 - 2013.
First the Graphs of h(x) and inverse:

Since x is always negative in h(x)
so inverse value must always be negative so negative sign was used.

 

[BhaiArshad]

Q:11 iii Please

http://maxpapers.com/wp-content/uploads/2012/11/9709_w14_qp_12.pdf

Restricted Graph:

 

[sara kamal]

Variant and paper

oops sorry,its P33 Q7 part 3

 

[Aina]

Here you go
Is it correct ?

Thanks
U subtracted 9.3x fron 3x and got 8x right..

 

[TheJDOG]

Thanks
U subtracted 9.3x fron 3x and got 8x right..

Yeah I treated 3^x as a term, so I subtracted 3^x from 9(3^x) to get 8^x

 

[Aina]

Yeah I treated 3^x as a term, so I subtracted 3^x from 9(3^x) to get 8^x

Alright
Thnx again

 

[papajohn]

http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_s10_qp_11/
Q:10 (i) Pleases, please

 

[The Sarcastic Retard]

http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_s10_qp_11/
Q:10 (i) Pleases, please

OB = OA + OC
OB = 4i + 2j + 4k
Unit vector = 1/sqroot(4^2 + 2^2 + 4^2) = 1/6(4i + 2j + 4k)

 

[Ram97]

oops sorry,its P33 Q7 part 3

I dont have p3
The Sarcastic Retard
TheJDOG

 

[Lyfroker]

I have topical past paper book. I can take images but cannot scan. I can upload the images here if you want.

No I got an online link, anyways thanks a lot

 

[TheJDOG]

http://maxpapers.com/wp-content/uploads/2012/11/9709_May-June-2011-All-Question-Papers.pdf
please explain q7 part3..of p33

Here you go , if I have any mistake tell me =)
For part three you just have to sub in any root from the two roots you got in part 1 in z^6 and expand and simplify, you will reach -64

 

[sara kamal]

Here you go , if I have any mistake tell me =)
For part three you just have to sub in any root from the two roots you got in part 1 in z^6 and expand and simplify, you will reach -64

Thanku,so basically its expansion of any of the conjugates??