Mathematics: Post your doubts here!

[LindaKim123]

MustafaMotani can you please summarize some formulas for each different cases of vector question, like when plane is perpendicular to one line.. and other complicate situation? I kept on trying to understand the question, but I always got confused at deciding each formula I should use..

 

[SararaIH]

here yu go ..
u shuld know standard formulas for surface area and volume of spheres.

Thank you! This was a lot of help
Should I know all mensuration formulas? :/

 

[Esme]

PhyZac

to be honest, from this step, you could (i would) directly jump to the conclusion. which is the prove.

As for Q8i) you're getting -10. that's correct. now you have to change signs because the limits have been exchanged. If you notice the limits are supposed to be (6-5)^1/2 and (6-2)^1/2
1 being your upper limit and 2 being the lower limit. However the question asks ask to write 2 as the upper limit and 1 as the lower limit. So when you exchange these limits you have to change the sign

Sounds a bit confusing but think about it, you'll get it

 

[PhyZac]

Esme and AlishaK
Thank you so much! Jazakum Allah khairan!
May S.w.t bless you both, and reward you! Aameen

 

[WayneRooney10]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_31.pdf
Why is the answer for question one only value, x>-1/2. Why not two? Also, please do Q2 as well. Thanks.

 

[autumnsakura]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_31.pdf
Need help with question 5 part 2. I don't know how to integrate tan (1/2 x). Thanks!

 

[aalisher]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_31.pdf

Need help with question 9

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_31.pdf
Need help with question 5 part 2. I don't know how to integrate tan (1/2 x). Thanks!

Tan(x/2) integrates to -ln(cos(x/2))

 

[Anika Raisa]

Th

Anika Raisa You also asked this question... there you go. Alice123 has solved it

Thank u Esme for remembering n tagging me!!

 

[SararaIH]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_32.pdf
I need help with Q2.i) and Q6.i) PLEEAASSEE!

 

[Anika Raisa]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_32.pdf
I need help with Q2.i) and Q6.i) PLEEAASSEE!

2.i) Let f(x)=x^3-8x-13
By trial n error
(as in take values of x= 0 to any no. as long as u dont get two a positive value; u may Consider decimals too sometimes)

so i found for x=3 we get a negative value which is -10
And for x=4 we get a positive valu which id 19
so as the values have different signs the root lies betwn x=3 n x=4

Hope u got this!

Btwn working on 6 i .... gotta wait!!

 

[aalisher]

I just don't get why there are 3 terms instead of 2?

 

[Xeee]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_31.pdf

Can someone please show me how to draw the Argand Diagram in 8th question??

 

[kiara15]

Loci in Argand diagrams

still didnt got point from here

 

[aalisher]

Rutzaba]light is abt to go...
try making factors of dnominator
2x^2 +5x+2
(1+2x)(x+2)
do partial fractions
integrate

I just don't get why there are 3 terms instead of 2?

 

[SararaIH]

2.i) Let f(x)=x^3-8x-13
By trial n error
(as in take values of x= 0 to any no. as long as u dont get two a positive value; u may Consider decimals too sometimes)

so i found for x=3 we get a negative value which is -10
And for x=4 we get a positive valu which id 19
so as the values have different signs the root lies betwn x=3 n x=4

Hope u got this!

Btwn working on 6 i .... gotta wait!!

I don't understand one thing. I mean, how do you know which value of x is the correct value? Because even if I take x=2, I get a negative value of -21.
And even if I take x=5, I get a positive value of 72. So how do I know which value of x to consider?

 

[Anika Raisa]

I don't understand one thing. I mean, how do you know which value of x is the correct value? Because even if I take x=2, I get a negative value of -21.
And even if I take x=5, I get a positive value of 72. So how do I know which value of x to consider?

yes i knw that is confusing... Bt wat u do is start from zero n go serially n if u get two different signs consecutively those are the two values of x! like over here u cud have said x lies betwn 0 to 5 but to be precise u have to say 3 to 4.
U c 4 x=3 u get positive value n for x=4 u get negative so they u get different values consequentially so the root lies betwn this two...
Umm cud i make the point? :~

Btwn i also told u the procedure of 6i ! c inbox!!!

 

[SararaIH]

yes i knw that is confusing... Bt wat u do is start from zero n go serially n if u get two different signs consecutively those are the two values of x! like over here u cud have said x lies betwn 0 to 5 but to be precise u have to say 3 to 4.
U c 4 x=3 u get positive value n for x=4 u get negative so they u get different values consequentially so the root lies betwn this two...
Umm cud i make the point? :~

Btwn i also told u the procedure of 6i ! c inbox!!!

Oh okay Thanks!

 

[Xeee]

May June 2011/31, question 8 anybody..?

 

[Anika Raisa]

Oh okay Thanks!

no prob!! btwn tomar ki 6 i er detailed solution dorkar?

 

[Twinks05]

Can anyone please explain to me how to solve question number 3 II part b from may/june 2012, paper 31
the link to the qp is here:
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_31.pdf

The mark scheme link is here:
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_ms_31.pdf

Please&Thankyou