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C1 help urgent pleasse

ok i've been revising + this paper just shockd me

http://www.xtremepapers.net/OCR/Maths/Specimen/C1/Paper%201.pdf

question 9) i) how are you mean't to differenatiate it?
i have no idea how u re-arrange that equation and differentiate it

and 10) c) why on earth does x-7(3x+22)+14 make x = -7??

please help :biggrin:

x
(edited 13 years ago)
Reply 1
Avatar for sohail.s
sohail.s
2
Original post by Sparkzz
ok i've been revising + this paper just shockd me

http://www.xtremepapers.net/OCR/Maths/Specimen/C1/Paper%201.pdf

question 9) i) how are you mean't to differenatiate it?
i have no idea how u re-arrange that equation and differentiate it

and 10) c) why on earth does x-7(3x+22)+14 make x = -7??

please help :biggrin:

x


what paper is this?
Reply 2
Avatar for Sparkzz
Sparkzz
OP
4
Original post by sohail.s
what paper is this?


soloman paper A
Reply 3
Avatar for jim666666
jim666666
Original post by Sparkzz
ok i've been revising + this paper just shockd me

http://www.xtremepapers.net/OCR/Maths/Specimen/C1/Paper%201.pdf

question 9) i) how are you mean't to differenatiate it?
i have no idea how u re-arrange that equation and differentiate it

and 10) c) why on earth does x-7(3x+22)+14 make x = -7??

please help :biggrin:

x


it rearranges to: 0.5x - x^-1 + 3
can you go from there?
Reply 4
Avatar for Sparkzz
Sparkzz
OP
4
Original post by jim666666
it rearranges to: 0.5x - x^-1 + 3
can you go from there?


yes yes thank u :biggrin:

and any ideas about 10) ii) ??
Reply 5
Avatar for asparkyn
asparkyn
15
Original post by Sparkzz
ok i've been revising + this paper just shockd me

http://www.xtremepapers.net/OCR/Maths/Specimen/C1/Paper%201.pdf

question 9) i) how are you mean't to differenatiate it?
i have no idea how u re-arrange that equation and differentiate it

and 10) c) why on earth does x-7(3x+22)+14 make x = -7??

please help :biggrin:

x


For the first differentiation question, treat x2\frac{x}{2} as 12x\frac{1}{2}x and −1x-\frac{1}{x} as −x−1-x^{-1}. You should be able to differentiate it following the usual rules.
Reply 6
Avatar for Sparkzz
Sparkzz
OP
4
Original post by asparkyn
For the first differentiation question, treat x2\frac{x}{2} as 12x\frac{1}{2}x and −1x-\frac{1}{x} as −x−1-x^{-1}. You should be able to differentiate it following the usual rules.



thanks :biggrin: + any ideas about 10) ii) for finding C?
Reply 7
Avatar for asparkyn
asparkyn
15
Original post by Sparkzz
thanks :biggrin: + any ideas about 10) ii) for finding C?


Well, I ran through it quickly, and I got x = 7 instead of x = -7. Where did you get that figure from? As far as I know x - 7(3x + 22) + 14 = 0 seems pretty correct.
Reply 8
Avatar for jim666666
jim666666
Original post by Sparkzz
yes yes thank u :biggrin:

and any ideas about 10) ii) ??


to find b set x to 0

to find c set the equations of the two lines equalto eachother and solve
Simultaneous equations with the two line equations.

Do you notice on the front page of the papers how it says that

"These sheets may be copied for use solely by the purchaser’s institute"?

Do you think that xtremepapers have paid Solomon Press or Shaun Armstrong for the use of these papers?
Reply 10
Avatar for Sparkzz
Sparkzz
OP
4
Original post by asparkyn
Well, I ran through it quickly, and I got x = 7 instead of x = -7. Where did you get that figure from? As far as I know x - 7(3x + 22) + 14 = 0 seems pretty correct.


how does x-7(3x+22)+14 =0 make x=7?
dont u expand the brackets out and get x-21x+154+14??
Reply 11
Avatar for marek35
marek35
Original post by Sparkzz
how does x-7(3x+22)+14 =0 make x=7?
dont u expand the brackets out and get x-21x+154+14??



Yes you do expand the brackets - check your expansion again btw.

x=7 is one of the answers - there are two.

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