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Author Topic: IGCSE MATHS Doubts  (Read 130271 times)

Offline Baladya

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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  :) ^^
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Offline Vin

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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~ »
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Offline Baladya

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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)
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Offline haris94

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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 »
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Offline Baladya

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Re: IGCSE MATHS Doubts
« Reply #79 on: May 05, 2010, 01:58:52 pm »
oo  okay :D thx man ;)
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Offline haris94

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Re: IGCSE MATHS Doubts
« Reply #80 on: May 05, 2010, 02:25:43 pm »
wlcm   :)
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Offline The Golden Girl =D

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Re: IGCSE MATHS Doubts
« Reply #81 on: May 05, 2010, 03:17:03 pm »
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Offline The Golden Girl =D

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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
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #83 on: May 05, 2010, 03:26:58 pm »
copy paste the question, or upload the paper plz.
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Offline The Golden Girl =D

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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 »
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Offline contraentry

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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.
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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)
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Offline Baladya

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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...
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Offline contraentry

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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.

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Offline Ghost Of Highbury

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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?
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