Mathematics: Post your doubts here!

[syed1995]

please nov 07 no 3 ii

from part i .. 32 + 80u + 80u^2

u = x+x^2 ..

expand the above equations with these data.. and find the coefficent of x^2 by adding all the x^2 variables..

 

[GorgeousEyes]

from part i .. 32 + 80u + 80u^2

u = x+x^2 ..

expand the above equations with these data.. and find the coefficent of x^2 by adding all the x^2 variables..

could u do the steps if u have time ?

 

[syed1995]

From your initial equation
(1)y^2-(4)y+(2k-13) = 0

a=1
b=4
c=2k-13

b^2-4ac=0
16-4(1)(2k-13)=0
16-8k+52=0
8k=68
k=8.5

 

[syed1995]

That doesn't work :|
K doesn't come as 8.5.

that above was for you ^^

 

[Maz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf
4(i)
I'm not at my best today.
herein, i got themethod from the ms but not why.

 

[ZainH]

From your initial equation
(1)y^2-(4)y+(2k-13) = 0

a=1
b=4
c=2k-13

b^2-4ac=0
16-4(1)(2k-13)=0
16-8k+52=0
8k=68
k=8.5

So I didn't need it in terms of x
Now I get it, you switched the equation so the value for C wouldn't have a 'y' in it.
Thanks for the , how many times has it been now? 3rd? Haha

 

[syed1995]

32 + 80u + 80u^2

u = x+x^2 ..

32+ 80(x+x^2) + 80(x+x^2)^2
32+80x+80x^2 + 80(x^2+2x^3+x^4)
32+80x+80x^2+80x^2+160x^3+80x^4
160x^2
160 coeffiecent.

 

[sma786]

daredevil , MustafaMotani thanks boys

 

[Maz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf
4(i)
I'm not at my best today.
herein, i got themethod from the ms but not why.

anyone???

 

[GorgeousEyes]

anyone???

4(x/k+k)-x^2
4x/k +4k -x^2
4x-4k^2-kx^2
4^2-4x-kx4 --. b^2 -4ac
16+16k =o
16=-16k
-1=k

 

[GorgeousEyes]

32 + 80u + 80u^2

u = x+x^2 ..

32+ 80(x+x^2) + 80(x+x^2)^2
32+80x+80x^2 + 80(x^2+2x^3+x^4)
32+80x+80x^2+80x^2+160x^3+80x^4
160x^2
160 coeffiecent.

Thank you

 

[sma786]

formula of unit vector? -.-

 

[Rutzaba]

formula of unit vector? -.-

take a direction vector and divide it by its modulus

 

[PANDA-]

around 60 or so .. but the 2012 ones were quite a disaster .. one of them went for 48

Welcome to the club

Mine is around 60 as well, but the recent papers ... well.

 

[syed1995]

Welcome to the club

Mine is around 60 as well, but the recent papers ... well.

If a paper like this 2012 comes.. then securing an A would be very very difficult. I also have S1 this year.. If i had M1 it would have been easier for me :\

 

[PANDA-]

If a paper like this 2012 comes.. then securing an A would be very very difficult. I also have S1 this year.. If i had M1 it would have been easier for me :\

M1 is quite easy... But it accounts for very little percentage

 

[syed1995]

M1 is quite easy... But it accounts for very little percentage

not really... M1 and S1 both account for equal amounts.. about 20% each.. and P1/P3 around 30% each...

 

[~`Heba`~ :)]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_11.pdf #11 how do i know the range? I got it Y>or equal 2 , but how do i know it's less than or equal to 10?

 

[sweetiepie]

Compound Interest Plz Some One Help Me Its Not In Alevels But Need It For My Sis

Q1. Calculate Compound Interest earned for Rs 5000 invested for 6 years at the rate of 7 % per annum?

Q2. In How Many years a sum of Rs 3000 would amount Rs 4814.07 at 6% compound semi – annually?

Q3. If Rs 300 are deposited at the beginning of each quarter in an account which earns interest rate of 8% compounded quarterly, what will be the amount after the
end of 3 and half years?

Q4. In How Many years a sum of Rs 3000 would amount Rs 6130.43 at 6% compounded quarterly?

Q5. Khalid Mahmud borrowed Rs 2500 from Sultan for 3 and half years at simple at 8% per annum. How Much Khalid Mahmud has to pay at the end of the period

Q6. What Is the Interest on Rs.1880.90 for one year @ 5 and half %?

Q7. Find the Compound Interest of Principal amount Rs 50,000 at the rate of 5% for 3 (3/4) years?

Q8. Mr. X wishes to save money to take a trip. If He deposits Rs 150 at the end of each month 24 months in an investment that pays 12% compounded monthly, how much will he have on deposit?

Q9. Mr. Y wants to accumulate Rs. 6000 in 8 years. He makes equal deposits at the end of each 5 months in an account. The rate of Interest is 8% compounded semi-annually. Find the value of each deposit?

Q10. Find the amount of Rs. 250 invested at the end of each of 5 successive years at 6% interest compounded annually?

Plz Answer With All Steps

 

[~`Heba`~ :)]

and please in nov11 #2 how do i know the number of roots for the equation without drawing the graph? http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_11.pdf