Author Topic: Math P2 Oct/Nov 2000 HELP !!!  (Read 2427 times)

Q80BOY

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Math P2 Oct/Nov 2000 HELP !!!
« on: May 06, 2009, 01:33:30 pm »
IGCSE (CIE) Mathematics October/November 2000

(ive attached the paper)

Page 4, Question 10 (Done)

Page 10, Question 22, Part (c) (Done)


Special thanks to DE, Astarmathsandphysics and Aishath
« Last Edit: May 06, 2009, 03:40:41 pm by Q80BOY »

Offline MissDE

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #1 on: May 06, 2009, 01:45:16 pm »


See, X>= 4.8

so  the answer might be {1,2,3,4}

not sure thu..

Q80BOY

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #2 on: May 06, 2009, 01:46:45 pm »


See, X>= 4.8

so  the answer might be {1,2,3,4}

not sure thu..

Thanks for the help, but how did we get 4.8 ??

Offline astarmathsandphysics

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #3 on: May 06, 2009, 01:47:54 pm »
IGCSE (CIE) Mathematics October/November 2000

(ive attached the paper)

Page 4, Question 10

Page 10, Question 22, Part (c)

Total number of questions: 2

I really hope u guys can help me out !!!  ;D

10)7 – 5x> – 17
 7+17>5x
5x<24 so x<4.8
22c)f(g(x))=3-2g(x)=3-2(x+1)/4=(12-2x-2)/4=(5-x)/2

Offline MissDE

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #4 on: May 06, 2009, 01:50:32 pm »
7-5x>= -17

-5x>=-17-7

-5x>= -24

divide by 5 and turn the sign (as u divide by nigative)...

Got it??

Feel free to ask if u don't understand..



Q80BOY

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #5 on: May 06, 2009, 02:07:41 pm »
Thanks for ur help DE and Astar, i appreciate it !!  ;D

Offline Aishath

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #6 on: May 06, 2009, 02:18:58 pm »
for ques.22 (c)

fg(x) means u hv to put g function in f.
f(x)=3 – 2x
g(x)=(x+1)/4

so wherever x is in f(x), put g(x) values in it.

f(x)=3 - 2x ya?
f(x)=3 - 2((x+1)/4)           (the bold one from top is put into x in f(X))
f(x)=3 - ((2x + 2)/4)            
then simplify (2x + 2)/4
which is       (x + 1)/2

then f(x)=3 - (x + 1)/2
            =6/2 - (x + 1)/2
therefore=(6 - x + 1)/2
            =(7 - x)/2
so thats the ans!!!!

fg(x)=(7 - x)/2

hope u got it ;)
« Last Edit: May 06, 2009, 02:21:34 pm by Aishath »

Offline sanity_master

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #7 on: May 06, 2009, 02:20:29 pm »
i guess im LATE :D lol

i hope i catch it nxt time :):D

Q80BOY

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Re: Math P2 Oct/Nov 2000 HELP !!!
« Reply #8 on: May 06, 2009, 02:28:24 pm »
i guess im LATE :D lol

i hope i catch it nxt time :):D

i will save a question for u next time  ;)