Mathematics: Post your doubts here!

[Thought blocker]

by practicing pastpapers

Acha xD

 

[krishnapatelzz]

https://www.facebook.com/groups/mathsrevision.examsolutions/ post doubts here for fast replies , and help others too

 

[justskedaddle]

How to do 5(ii) (b) . 9709_s13_qp_13

 

[krishnapatelzz]

View attachment 62033
How to do 5(ii) (b) . 9709_s13_qp_13

https://www.8mundo.com/post/mathematics-9709-paper-1-working-solutions-for-past-papers-6553003 you have solved papers here

 

[krishnapatelzz]

https://www.8mundo.com/post/mathematics-9709-paper-1-working-solutions-for-past-papers-6553003 this is helpful for everyone who are taking 9709 P1 , these are solved papers from 2003 to 2013

 

[Saly Elkady]

How to solve that?

 

[Thought blocker]

How to solve that?

Using binomial theorem

 

[Saly Elkady]

Using binomial theorem

Yeah I know that but I want the working because I'm not getting the answer right

 

[Thought blocker]

Yeah I know that but I want the working because I'm not getting the answer right

n = 6 and coffecient is twewnty one over four???
i did this in hurry :V

 

[Saly Elkady]

n = 6 and coffecient is twewnty one over four???
i did this in hurry :V

Show your working please

 

[Thought blocker]

I am not able to upload pic.

Show your working please

But here is how u can do...
Open mf9 see the binomial formula..
expand the power of n bracket till x squared term
then multiply that expansion with the other bracket
compare the coff of x and equate it to 7, using it u will get n = 6
then substitiue that value to get coff of x square

 

[Thought blocker]

use this formula

 

[Saly Elkady]

I am not able to upload pic.

But here is how u can do...
Open mf9 see the binomial formula..
expand the power of n bracket till x squared term
then multiply that expansion with the other bracket
compare the coff of x and equate it to 7, using it u will get n = 6
then substitiue that value to get coff of x square

thanks

 

[Thought blocker]

thanks

u get it? xD

 

[Saly Elkady]

u get it? xD

Honestly no xD
I used tried using this formula ( Tr+1= (ncr) ( a) ^n-r X (b)^r )since it's easier than expanding and confusing myself so ya

 

[Thought blocker]

Honestly no xD
I used tried using this formula ( Tr+1= (ncr) ( a) ^n-r X (b)^r )since it's easier than expanding and confusing myself so ya

Y u even using that formula? That will complicate the thing.
Use the other formula which is very simple to use in this case..
I will explain u.. dw

first of all expand till x squared term and reply me once u do it.

 

[Thought blocker]

So much of time in this small expansion???

 

[Saly Elkady]

Nope Internet problems anyway
Now what next?

 

[Thought blocker]

Nope Internet problems anyway
Now what next?

now multiply the brackets.. do it and reply me... multiply carefully no mistakes should be done

to minimiz efforts, just multiply that way that u get coff of x and x squared (if u dont get this, then do multiplication normally like i mentioned above) and reply me.

 

[Saly Elkady]

And the working