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Mathematics: Post your doubts here!

AbbbbY

AbbbbY

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iKhaled said:
who can solve this question ?
Click to expand...

x = 2*2^0.5
y= -2

Complex Numbers working is tough to show, so I'll simply tell you how it's to be done. Pretty easy question.

Substitute w=x+iy in both sides and expand
Then compare both sides (imaginary and real).
 
princess787

princess787

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heyy! cn sum1 please help me with nov 2011 paper 1 question 7 i) variant 1??
i simply added all the lengths n got 6y+8x=48 ...... bt d ms is sayin sumthing different.. sumthing like y=1/6(48-8x)... how???????????? please help! thanx in advance!! :) :*
 
AbbbbY

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princess787 said:
heyy! cn sum1 please help me with nov 2011 paper 1 question 7 i) variant 1??
i simply added all the lengths n got 6y+8x=48 ...... bt d ms is sayin sumthing different.. sumthing like y=1/6(48-8x)... how???????????? please help! thanx in advance!! :) :*
Click to expand...


y= 1/(6(48-8x) is the same thing as y = (48-8x)/6 which is the same thing as 6y+8x=48

1/(6(48-8x) and (48-8x)/6 are both acceptable but the third one is not because it asks for y = ...

It's like writing x^-1 and 1/x; essentially the same thing so both correct even if the marking scheme mentions either one.
 
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fahaddewan

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I need help with this S1 probability problem. See the attached file.
 

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autumnsakura

autumnsakura

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http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_71.pdf
Need help with question 7 part 2. I don't get why they don't square the constant 2 for cola but square the constant 1/2 for tonic water.
Btw, can anyone explain why some constant for variance is squared and some isn't. I know it's something to do with sum and total but sometimes the question isn't really clear whether it's sum or not. THANKS!!!
 
minie23

minie23

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The point P,Q,R have coordinates (3,-1),(2 5) n (8 3) respectively. Find the equation of the straight line joining P to the midpoint of QR
​
Plz work it out n gve me the answr plz thx in advance
 
minie23

minie23

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The point P,Q,R have coordinates (3,-1),(2 5) n (8 3) respectively. Find the equation of the straight line joining P to the midpoint of QR
​
Plz work it out n gve me the answr plz thx in advance
 
cross

cross

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LindaKim123 said:
No no no I mean, I didn't really get how to do the hypothesis part, and I have exam tmrw, so I'm really depressed..
Click to expand...

Oh, so yeah we basically have the same exam, and the same reason to be depressed. However, I'm not that bad at hypothesis so I can have a go at helping with the question that's troubling you :)
 
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LindaKim123

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cross said:
Oh, so yeah we basically have the same exam, and the same reason to be depressed. However, I'm not that bad at hypothesis so I can have a go at helping with the question that's troubling you :)
Click to expand...


haha yeah! :D Oh really??
Can you do this question ??

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_71.pdf

question 2 & question 4!! please!

and, if you can summarize the important point to remember for the hypothesis part, I would really appreciate it!!
 
cross

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384640_10201234378960983_856775000_n.jpg
 
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