Mathematics: Post your doubts here!

[neha saleem]

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s06_qp_3.pdf

q3 sum1 pls help..........specially dy/dthetha and dy/dx..........i kind of did it..........but i m so cnfusd at the dy/dx........i differnttd bt wat we do aftr tht?

 

[me_lonelyboy]

I cannot get the pic of the question. But figuring from the markscheme there is some mistake. Simplifying with surd rules it should be 10 cbrt(7.1) hence x can be 0.1. Upload the question again dude.

Ah. So it should be 7.1 huh.
Ok, here is the question. Again.

 

[me_lonelyboy]

cube root 7100 can be written as cube root 71 * 100
ths can further be written as surd form like 10 cube root 71
using ur expansion 71 =( 8 - 9x )
replace this in the surd form expression...it will become 10 cube root ( 8 - 9x )

PS i need the expansion to get the result x=0.1
upload it plz. im too lazy to work tht out.

In the marking scheme they are writing cube root of 7100 as cube root of 7.1 and cube root of 1000. I think.
Cube root of 1000 would be equal to 10.
So, giving 10 cube root of 7.1..
Than making 7.1=( 8 - 9x ) giving x=0.1
but how did they get 10 cube root of ( 8 - 9x )?!

In your method 71 =( 8 - 9x ) give x= -7

btw, I am asking HOW they got the x value as 0.1 there. After getting the x value, I know how to proceed. Getting the x value correctly is the problem.

 

[RoOkaYya G]

In the marking scheme they are writing cube root of 7100 as cube root of 7.1 and cube root of 1000. I think.
Cube root of 1000 would be equal to 10.
So, giving 10 cube root of 7.1..
Than making 7.1=( 8 - 9x ) giving x=0.1
but how did they get 10 cube root of ( 8 - 9x )?!

In your method 71 =( 8 - 9x ) give x= -7

btw, I am asking HOW they got the x value as 0.1 there. After getting the x value, I know how to proceed. Getting the x value correctly is the problem.

yeah i jst solved it without knwin the expansion.
its 7.1 * 1000 sorry. i took it for square root by mistake
it said use the expansion from part (i) so u should assume the expansion to be equal to cube root 7100 which is now equal to 10 cube root 7.1

so :

10 cube root 7.1 = 10 cube root (8 -9x)
cancel 10 cube root on both side

7.1 = 8 - 9x
x = 0.1

 

[Thought blocker]

Ah. So it should be 7.1 huh.
Ok, here is the question. Again. View attachment 49278

According to me it should be 7.1 rather than 71 IDK else .-.

 

[Thought blocker]

yeah i jst solved it without knwin the expansion.
its 7.1 * 1000 sorry. i took it for square root by mistake
it said use the expansion from part (i) so u should assume the expansion to be equal to cube root 7100 which is now equal to 10 cube root 7.1

so :

10 cube root 7.1 = 10 cube root (8 -9x)
cancel 10 cube root on both side

7.1 = 8 - 9x
x = 0.1

Ms me to 71 hai 7.1 nai .-.

 

[RoOkaYya G]

Ms me to 71 hai 7.1 nai .-.

MS ghalat hain

 

[Thought blocker]

MS ghalat hain

HAina... Wohi to mene bola usko .-.

 

[me_lonelyboy]

yeah i jst solved it without knwin the expansion.
its 7.1 * 1000 sorry. i took it for square root by mistake
it said use the expansion from part (i) so u should assume the expansion to be equal to cube root 7100 which is now equal to 10 cube root 7.1

so :

10 cube root 7.1 = 10 cube root (8 -9x)
cancel 10 cube root on both side

7.1 = 8 - 9x
x = 0.1

Using expansion from part (I) means I should assume that 10 cube root of 7.1 is equal to cube root of 8-9x.
NOT: 10 cube root of 7.1 is equal to 10 cube root of 8-9x.
As part (I) is for only cube root of 8-9x.
So how did that 10 come there? In your ans?..n the one given in marking scheme. -.-

 

[CЯeScɘnt]

Is there anyone who's having the notes of combination and permutation ?

 

[RoOkaYya G]

Using expansion from part (I) means I should assume that 10 cube root of 7.1 is equal to cube root of 8-9x.
NOT: 10 cube root of 7.1 is equal to 10 cube root of 8-9x.
As part (I) is for only cube root of 8-9x.
So how did that 10 come there? In your ans?..n the one given in marking scheme. -.-

cube root 7100 = cube root 8-9x
so 10 cube root 7.1 = 10 cube root 8-9x
in surd form

 

[RoOkaYya G]

Is there anyone who's having the notes of combination and permutation ?

ask chishtyguy he has threads for those notes.

 

[CЯeScɘnt]

chishtyguy Thought blocker are u having any notes or video lectures for comb.n permutation ? if u guys have plzz lemme know .!

 

[chishtyguy]

chishtyguy Thought blocker are u having any notes or video lectures for comb.n permutation ? if u guys have plzz lemme know .!

https://www.khanacademy.org/math/pr...lc/v/factorial-and-counting-seat-arrangements
See all the videos...
Secondly u can only master P&C by practicing past papers, Unlike all the other topics of S1 there is no memorization or proper method.. U only have to understand the concept.... ask RoOkaYya G she has just given the papers..

 

[Thought blocker]

chishtyguy Thought blocker are u having any notes or video lectures for comb.n permutation ? if u guys have plzz lemme know .!

http://www.examsolutions.net/maths-revision/syllabuses/CIE/period-1/S1/module.php
Chapter 2 has video explanations. All the best.

 

[The Sarcastic Retard]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s06_qp_3.pdf

q3 sum1 pls help..........specially dy/dthetha and dy/dx..........i kind of did it..........but i m so cnfusd at the dy/dx........i differnttd bt wat we do aftr tht?

https://www.xtremepapers.com/commun...st-your-doubts-here.9599/page-712#post-870716

 

[CЯeScɘnt]

http://www.examsolutions.net/maths-revision/syllabuses/CIE/period-1/S1/module.php
Chapter 2 has video explanations. All the best.

thanks man !! I hope thats gonna help me to some extent ..

 

[Zainab Riaz]

Any one please?

 

[Thought blocker]

Any one please?

I already sent you the answer. Well thank you.

 

[Rohaan Nadeem]

se

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s06_qp_3.pdf

q3 sum1 pls help..........specially dy/dthetha and dy/dx..........i kind of did it..........but i m so cnfusd at the dy/dx........i differnttd bt wat we do aftr tht?