« previous next »
Pages: 1 ... 4 5 [6] 7 8 ... 80   Go Down

Author Topic: IGCSE MATHS Doubts  (Read 131436 times)

Offline Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #75 on: May 05, 2010, 01:02:05 pm »
f(x)=3x-1
find f^-1f(x)

Answer is x. Can u plz show me the steps?

Thnksssssss  :) ^^
Logged
Looks like i ran out of cool signatures :|

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: IGCSE MATHS Doubts
« Reply #76 on: May 05, 2010, 01:11:35 pm »
f-1(x) =       x + 1
                   3
                          
put 3x - 1 as x in eqn 1 ..u'll get it

(3x -1) - 1
-----------
     3


= x
« Last Edit: May 05, 2010, 01:24:36 pm by ~VIN1094~ »
Logged

Offline Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #77 on: May 05, 2010, 01:39:47 pm »
... but aren't u supposed to substitute first... like 3(3x-1)-1 cuz its f-1f(x) not ff-1(x)
Logged
Looks like i ran out of cool signatures :|

Offline haris94

  • SF Senior Citizen
  • *****
  • Posts: 930
  • Reputation: 984
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #78 on: May 05, 2010, 01:51:43 pm »
Quote from: Baladya on May 05, 2010, 01:39:47 pm
... but aren't u supposed to substitute first... like 3(3x-1)-1 cuz its f-1f(x) not ff-1(x)

they hv asked f-1f(x)
so u hv to substitute the value of f(x), that is 3x-1, in the equation f-1(x)
« Last Edit: May 05, 2010, 01:55:28 pm by haris94 »
Logged
WHAT WE DO IN LIFE ECHOES AN ETERNITY

Offline Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #79 on: May 05, 2010, 01:58:52 pm »
oo  okay :D thx man ;)
Logged
Looks like i ran out of cool signatures :|

Offline haris94

  • SF Senior Citizen
  • *****
  • Posts: 930
  • Reputation: 984
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #80 on: May 05, 2010, 02:25:43 pm »
wlcm   :)
Logged
WHAT WE DO IN LIFE ECHOES AN ETERNITY

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: IGCSE MATHS Doubts
« Reply #81 on: May 05, 2010, 03:17:03 pm »
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: IGCSE MATHS Doubts
« Reply #82 on: May 05, 2010, 03:21:33 pm »
i got another question ...in  nov 2000 paper 2 math igcse

it's question 18) part a) amd b) ...how do we get the numbers "cuz i saw the m.s. but i still haven't understood it yet , u see"



thx in advance
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE MATHS Doubts
« Reply #83 on: May 05, 2010, 03:26:58 pm »
copy paste the question, or upload the paper plz.
Logged
divine intervention!

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: IGCSE MATHS Doubts
« Reply #84 on: May 05, 2010, 03:29:50 pm »
« Last Edit: May 05, 2010, 03:32:01 pm by the golden girl »
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline contraentry

  • SF Citizen
  • ***
  • Posts: 177
  • Reputation: 1303
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #85 on: May 05, 2010, 03:30:48 pm »
Frequency Density = Frequency / Class Width.

Rearrange the formula to get : Class Width * Frequency Density = Frequency

For part (b) you may also make use of the aforementioned formula.
Logged

Offline The Golden Girl =D

  • Without Allah I'm nothing <3
  • Honorary Member
  • SF Overlord
  • *****
  • Posts: 13757
  • Reputation: 65532
  • Ain't Nothin worth your tears =D
    • www.thegoldengirl157.blogspot.com
Re: IGCSE MATHS Doubts
« Reply #86 on: May 05, 2010, 03:33:12 pm »
Quote from: contraentry on May 05, 2010, 03:30:48 pm
Frequency Density = Frequency / Class Width.

Rearrange the formula to get : Class Width * Frequency Density = Frequency

For part (b) you may also make use of the aforementioned formula.


i didn't get what u said abt part b)
Logged
Verily, in the remembrance of Allah do hearts find rest(13:28)

Please, Don't forget to Include GG in your Prayers =D

Offline Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #87 on: May 05, 2010, 03:39:48 pm »
it means that u should use same forumla. Frequency/class width=Frequency Density. (class width=6-4=2.... Frequency=8 babies) So 8/2=4. Just draw it...
Logged
Looks like i ran out of cool signatures :|

Offline contraentry

  • SF Citizen
  • ***
  • Posts: 177
  • Reputation: 1303
  • Gender: Male
Re: IGCSE MATHS Doubts
« Reply #88 on: May 05, 2010, 03:48:17 pm »
I have stumbled upon a slight issue in solving one of the Paper 4's, could someone please explain how to go about solving this ?

part (d) & (e) of question 5, on the attached sheet.

Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE MATHS Doubts
« Reply #89 on: May 05, 2010, 03:57:03 pm »
Quote from: contraentry on May 05, 2010, 03:48:17 pm
I have stumbled upon a slight issue in solving one of the Paper 4's, could someone please explain how to go about solving this ?

part (d) & (e) of question 5, on the attached sheet.



which year is this from?
Logged
divine intervention!
Pages: 1 ... 4 5 [6] 7 8 ... 80   Go Up
« previous next »