Mathematics: Post your doubts here!

[Tabi Sheikh]

guys any one know that if there will be a deduction of mark if we directly solve quadratic equation from the calculator and just write down the answer without showing our steps

 

[A star]

11ii) any one http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_12.pdf
any one ???????????????????????????????????????????????????????????????????????????????????

 

[Jiyad Ahsan]

for 11ii
take the area under line graph.... it will give u all the area under graph shaded + unshaded
take area under curve by integrating the curve equation (gives unshaded are)
subtract the two

daredevil the question is volume not area..
sorry for sounding like a know-it-all

 

[A star]

any one answer this question

 

[Jiyad Ahsan]

11ii) any one http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_12.pdf

sorry man stupid webcam isnt taking the stupid photo, wait a sec

 

[Jiyad Ahsan]

oki i'll just type the formula here,
since V=pi ((integral)y^2) dx
Volume here is V=pi ((integral) (y2^2-y1^2))dx

y2 is the line, y1 is the curve
you square y2 then subtract square of y1,
integrate the whole thing with definite boundaries 5 and 0
multiply with pi at the end

 

[A star]

no i know the formulae i know the limits
but my answer is comming wrong idk y ?

 

[A star]

its comming 10pie/3 - 2pie

 

[Jiyad Ahsan]

no i know the formulae i know the limits
but my answer is comming wrong idk y ?

the answer is (11/12)pi units^3
the step before it i have
pi ((-10/3(1/8) - 2/3(4)) - (-10/3 - 2/3))

 

[~`Heba`~ :)]

For the first part you HAVE to sketch .. The. State the number of solutions .. Let's say 2
So then you check the other question it says upto 20pie but u have till 0-2pie .. So u consider o-2pie as one revolution and then count number of revolutions u need .. Till 20 pie it will be around 10 maybe .. And u have for one resolution 2 solutions so for 10 resolutions .. Just multiply

yeah but in (ii) It's asking about a different equation , not the one i already sketched. and it's for one mark , do i have to sketch that as well?

 

[~`Heba`~ :)]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_11.pdf
#10 (iii) I got the g-1(x)=(X+25/4)^0.5 +2 , in the ms it's different , can you please explain.

 

[A star]

Assalamoalaikum Wr Wb!

Post your doubts here. Make sure you give the link to the question paper when posting your doubts.


May Allah give us all success in this world as well as the HereAfter...Aameen!!

And oh yeah, let me put up some links for A level Maths Notes here.

Check this out! - Nice website, with video tutorials for everything! MUST CHECK

My P1 Notes! - Only few chapters available at the moment!

Maths Notes by destined007

Some Notes for P1 and P3 - shared by hamidali391

A LEVEL MATHS TOPIC WISE NOTES

MATHS A LEVEL LECTURES

compiled pastpapers p3 and p4 - by haseebriaz

Permutations and Combinations (my explanation)- P6

Permutations and Combinations - P6

Vectors - P3

Complex No. max/min IzI and arg(z) - P3

Sketcing Argand Diagrams - P3 (click to download..shared by ffaadyy)

Range of a function. - P1

guys this might help

 

[littlecloud11]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_33.pdf

10 (i)
Thanks!

Dug iKhaled or anyone.

 

[PhyZac]

guys any one know that if there will be a deduction of mark if we directly solve quadratic equation from the calculator and just write down the answer without showing our steps

You better show your working, in every thing.
You do want to risk your marks, atleast this paper!

May Allah S.W.T grant us all success in this paper, Aameen.

 

[daredevil]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w10_qp_12.pdf

hey has anyone answered this question 7 from this paper cz i forgot if u did can u guyss explain it to me esp the last part or if u have already done that then just tell me where u did that thnx

 

[Sarah22]

for 7(iii)
f(x)=(x-2)^2+3
f=hg
h(g(x))=(x-2)^2+3
h(g(x))=(g(x))^2+3, take g(x)=x
h(x)=x^2+3
Thank you very much.. But I dont understand why you took g(x)=x

 

[daredevil]

thnakkks

 

[snowbrood]

thnakkks

Prove the identity (sin x + cos x)(1 − sin x cos x) ≡ sin3 x + cos3 x. [3]
(ii) Solve the equation (sin x + cos x)(1 − sin x cos x) = 9 sin3 x for 0◦ ≤ x ≤ 360◦. can anyone solve part (ii) i dont get it @A

 

[Sarah22]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_12.pdf

hey has anyone answered this question 7 from this paper cz i forgot if u did can u guyss explain it to me esp the last part or if u have already done that then just tell me where u did that thnx

(i) f(x)=x^2-4x+7
For this you can follow the usual method,
(x-2)^2-4+7
(x-2)^2+3
Range is: f(x)>=3. You can see this form the answer (x-2)^2+3

(ii) f−1(x)=y
y=(x-2)^2+3
square root of y-3=x-2
x=square root of (y-3)+2
then you interchange x with y
y=square root of (x-3)+2, which is your f-1(x)

 

[PhyZac]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_33.pdf

10 (i)
Thanks!

Dug iKhaled or anyone.

I tried my best to understand, but it is hard. I found this.
https://www.xtremepapers.com/commun...st-your-doubts-here.9599/page-323#post-485476