Author Topic: Math Paper 4  (Read 3544 times)

Offline ismailb_1993

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Math Paper 4
« on: May 18, 2010, 09:58:23 am »
As we all know, the last question will probably be on sequences....does anyone have any useful notes regarding them??

Offline ismailb_1993

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Re: Math Paper 4
« Reply #1 on: May 18, 2010, 10:07:02 am »
and maybe some tips on graphs would help?

also i had a question in regards to function graphs...
sometimes you have to plot the points of a function...and they sometimes ask to find the inverse of a point for intance f^-1(5)...in this case what should i do?

Offline BusinessMaNiac! ( Shizzle)

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Re: Math Paper 4
« Reply #2 on: May 18, 2010, 02:12:15 pm »
First find the inverse..
then the answer u get, use it on the x-axis....

Sometimes they give gf(x)...
In this case, u wud start from the Left eh?
::)

Offline ismailb_1993

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Re: Math Paper 4
« Reply #3 on: May 18, 2010, 02:20:27 pm »
First find the inverse..
then the answer u get, use it on the x-axis....

Sometimes they give gf(x)...
In this case, u wud start from the Left eh?
::)

shazil? if ive mistaken you then sorry

but i see this questions are usually worth 1 mark...and the process you have outlined is worth atleast 3 marks.

Offline pap19

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Re: Math Paper 4
« Reply #4 on: May 18, 2010, 02:25:06 pm »
pls tell me fast hot to do entire question no3 of maths paper 4 oct/nov 2000

Offline ismailb_1993

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Re: Math Paper 4
« Reply #5 on: May 18, 2010, 02:32:40 pm »
pls tell me fast hot to do entire question no3 of maths paper 4 oct/nov 2000

you can use the cos rule for the first question...you know three of the lengths of the triangle that is 4,5,6. calc as follows:

to find abc
(4^2+5^2-6^2) / (2x4x5)

when you get the answer of that you use cos^-1 and you get the angle ABC

for B.) and C.) ill have to draw it which i obviously cant do here.

Saavya

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Re: Math Paper 4
« Reply #6 on: May 18, 2010, 02:44:14 pm »
'Common Difference' Sequences

The general term for term number 'n' , common diff. 'd' and first term 'a'is:

dn + (a-d)

Find the nth term in this sequence : 13, 20, 27, 34, 41, 48 ...

a=13, d= 7

nth term = dn + (a-d) = 7n + (13-7) = 7n +6

this is one way of finding the nth term but its long i knoww

i get confused with the other ones though

Offline Aayesha

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Re: Math Paper 4
« Reply #7 on: May 18, 2010, 03:02:10 pm »
yeah ..but how to find it when there is no common difference between the terms ???? ???

Offline ismailb_1993

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Re: Math Paper 4
« Reply #8 on: May 18, 2010, 03:08:39 pm »
yeah ..but how to find it when there is no common difference between the terms ???? ???

those are the other ones she's talking about :(

Offline ismailb_1993

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Re: Math Paper 4
« Reply #9 on: May 18, 2010, 03:09:11 pm »
'Common Difference' Sequences

The general term for term number 'n' , common diff. 'd' and first term 'a'is:

dn + (a-d)

Find the nth term in this sequence : 13, 20, 27, 34, 41, 48 ...

a=13, d= 7

nth term = dn + (a-d) = 7n + (13-7) = 7n +6


this is one way of finding the nth term but its long i knoww

i get confused with the other ones though


thanks alot!!! thats really helpful!!

Offline Aayesha

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Re: Math Paper 4
« Reply #10 on: May 18, 2010, 03:13:09 pm »
oh okay. Thanks  :)

Offline diva_sparkles

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Re: Math Paper 4
« Reply #11 on: May 18, 2010, 03:15:26 pm »
thanks alot!!! thats really helpful!!


no actualy this is used whn there is a common difference!!
otherwise u hv to find someother way 2 do it
Don’t ask what the world needs. Ask what makes you come alive, and go do it. Because what the world needs is people who have come alive!!

Saavya

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Re: Math Paper 4
« Reply #12 on: May 18, 2010, 03:16:35 pm »
'Changing Difference' Sequences

The general term for term number 'n' , common diff. 'd' , first term 'a' and difference change 'c'is:

a+d(n-1)+c/2(n-1)(n-2)

i cant remember this one its long and u have to solve so many steps in order to reach the nth term

eg. find the nth term of 5, 7, 10, 14, 19 ........

remembering that the nth term is given by:

        1st term, 'a' =5

        first difference 'd' = 2

        difference increase 'c' = 1

replace and see what u get

i will only rely on my brain for this one

Saavya

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Re: Math Paper 4
« Reply #13 on: May 18, 2010, 03:18:07 pm »
thanks alot!!! thats really helpful!!



ur welcome :)

Saavya

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Re: Math Paper 4
« Reply #14 on: May 18, 2010, 03:19:24 pm »
no actualy this is used whn there is a common difference!!
otherwise u hv to find someother way 2 do it


the other way is to use yer brain im goin 2 do that for the changing difference ones :(