Maths, Addmaths and Statistics: Post your doubts here!

[flora0347]

Re: O'level Maths, Addmaths and Statistics help available he

Plz tell m hw cn i solve diz Q " A wire of length 200cm is cut into two parts and each part is bent to form a square. If the area of the larger square is 9 times that of the smaller square , find the perimeter of the larger square"

 

[Nibz]

Re: O'level Maths, Addmaths and Statistics help available he

@flora:
Length of wire = 200cm
It's cut into two pieces:
Let one piece be x cm ;
The second would be 200 - x cm
Area of the 1st square = x^2
Area of the 2nd one = (200 - x)^2 => 40000 - 400x + x^2
Then:
9 times x^2 = 40000 - 400x + x^2
8x^2 + 400x - 40000 = 0 (Solve this quadratic equation)
You would get x = -100 or x= 50 (since length can't be negative, ignore -100)
So perimeter of smaller square = 50
Perimeter of larger one = 200 -50 = 150 cm

 

[flora0347]

Re: O'level Maths, Addmaths and Statistics help available he

THANKS

 

[mehranshaikh]

Re: O'level Maths, Addmaths and Statistics help available he

Can you tell me how to calculate area of a quadrilateral using co-ordinates? There is a formula for triangle .

 

[leosco1995]

Re: O'level Maths, Addmaths and Statistics help available he

@hamidali391: thanks... I didn't try your solution yet but I will soon after I do some past papers.

I need help with Q6 (ii) of this paper, I never really studied 'reverse differentiation' properly in school. =(

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

@leosco1995: Look at the picture below. If you don't understand, feel free to ask again.

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

@mehranshaikh: Here, right click on the picture and save picture on your desktop. If you don't understand anything, feel free to ask.

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

AoA!
For adnanji and any one else who may be able to derive help from this.
The topic of Permutations and Combinations is covered in these links:
1. http://www.tutors4you.com/permutationco ... torial.htm
2. http://www.omegamath.com/Data/d2.2.html
3. http://www.mathsisfun.com/combinatorics ... tions.html
For Relative Velocity, I have already posted the links of lectures earlier in this thread! Kindly check that out.
For Graphs of Functions, do check out this video: http://www.youtube.com/watch?v=R0RM6Fei ... ure=fvwrel
I have some general "Functions" notes that may be helpful.
=> A function (also called a mapping) is a relation in which every element in the domain has a unique image in the range.
=>Domain: Set of x values which can be put into the function.
=>Range: Set of values the function f(x) may take is the range (or co-domain or image set).
=>Vertical Line Test: used to determine if a relation is a function or not. If any vertical line intersects the graph of f at exactly one point, the relation is a function.
=> Horizontal Line Test: used to determine whether a function is one-to-one. Every horizontal line intersects the graph of f AT MOST once!
=> Only one-to-one functions have inverses.
=> Geometrically, the graph of f inverse is the reflection of the graph of f in the line y = x.
=> In general, g(f) is not equal to f(g).

 

[leosco1995]

Re: O'level Maths, Addmaths and Statistics help available he

@hamidali391: I got the part up to when you said you multiply by two and then divide by two, I didn't get the integration after that at all. :s

BTW, I also don't get Q8 of this paper. Any help on that would be appreciated.

 

[Muhammad Talha]

Re: O'level Maths, Addmaths and Statistics help available he

hey plz tell me that how to covert a decimal value into that radian π???
n for paper 1 r u doin the prac of p1 from pst paprs or both p1 n p2?????

 

[OakMoon!]

Re: O'level Maths, Addmaths and Statistics help available he

@leosco1995: What I did was just arrange the integral to convert it into the given form. The integral of (2xlnx + x) is x­²lnx, isn't it? Since, integration is the reverse of differentiation. So I equaled integration of (x+2xlnx) to x­²lnx with the limits applied. And then separated the integral to: "integral of x + integral of 2xlnx' and arranged the equation.

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

can anyone please explain the Conrad Dickens and Shakespeare question in Add Maths book in permutation and combination???

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

AoA!
For adnanji and any one else who may be able to derive help from this.
The topic of Permutations and Combinations is covered in these links:
1. http://www.tutors4you.com/permutationco ... torial.htm
2. http://www.omegamath.com/Data/d2.2.html
3. http://www.mathsisfun.com/combinatorics ... tions.html
For Relative Velocity, I have already posted the links of lectures earlier in this thread! Kindly check that out.
For Graphs of Functions, do check out this video: http://www.youtube.com/watch?v=R0RM6Fei ... ure=fvwrel
I have some general "Functions" notes that may be helpful.
=> A function (also called a mapping) is a relation in which every element in the domain has a unique image in the range.
=>Domain: Set of x values which can be put into the function.
=>Range: Set of values the function f(x) may take is the range (or co-domain or image set).
=>Vertical Line Test: used to determine if a relation is a function or not. If any vertical line intersects the graph of f at exactly one point, the relation is a function.

=> Horizontal Line Test: used to determine whether a function is one-to-one. Every horizontal line intersects the graph of f AT MOST once!
=> Only one-to-one functions have inverses.
=> Geometrically, the graph of f inverse is the reflection of the graph of f in the line y = x.
=> In general, g(f) is not equal to f(g).

Thanks.
Sorry but I didn't get the vertical and horizontal line tests!

 

[abc123]

Addmaths

Could you help me out with the following in http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf:
5 part 2, 7b, 8 and 10 please!

 

[abc123]

Re: O'level Maths, Addmaths and Statistics help available he

AoA!
For adnanji and any one else who may be able to derive help from this.
The topic of Permutations and Combinations is covered in these links:
1. http://www.tutors4you.com/permutationco ... torial.htm
2. http://www.omegamath.com/Data/d2.2.html
3. http://www.mathsisfun.com/combinatorics ... tions.html
For Relative Velocity, I have already posted the links of lectures earlier in this thread! Kindly check that out.
For Graphs of Functions, do check out this video: http://www.youtube.com/watch?v=R0RM6Fei ... ure=fvwrel
I have some general "Functions" notes that may be helpful.
=> A function (also called a mapping) is a relation in which every element in the domain has a unique image in the range.
=>Domain: Set of x values which can be put into the function.
=>Range: Set of values the function f(x) may take is the range (or co-domain or image set).
=>Vertical Line Test: used to determine if a relation is a function or not. If any vertical line intersects the graph of f at exactly one point, the relation is a function.



=> Horizontal Line Test: used to determine whether a function is one-to-one. Every horizontal line intersects the graph of f AT MOST once!
=> Only one-to-one functions have inverses.
=> Geometrically, the graph of f inverse is the reflection of the graph of f in the line y = x.
=> In general, g(f) is not equal to f(g).

horizontal test is you pass a horizontal line across any graph. If it intersects the graph at two points it means its not a one-one function

 

[rehan751]

Re: O'level Maths, Addmaths and Statistics help available he

Can we use synthetic division method to solve cubic equations?

 

[Rampag3r]

Re: O'level Maths, Addmaths and Statistics help available he

http://www.xtremepapers.me/CIE/Cambridg ... _qp_22.pdf


Need help in question number 8(b)
Why do we mutiply by 84?

 

[xhizors]

Re: O'level Maths, Addmaths and Statistics help available he

any genious
plz help i just want hint about finding C i have done with Q,, asap

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

any genious
plz help i just want hint about finding C i have done with Q,, asap

Equation Of AB:
m=(9-10/8+4)=3/4
y=mx+c
Put the values of A
0=3/4(-4)+c
c=3
y=(3/4)x+3

(m of PQ)(m of AB)=-1
m of PQ=-4/3
y=(-4/3)x+c

Substitute values of P

10=-4/3 +c
c=34/3
y=(-4/3)x+34/3
Line AB and PQ intersect at C

Solve the two simultaneous equations..
x=20/3 and y=8
Therefore coordinates of C are (20/3,8)
HOPE THAT HELPED!!

 

[Muhammad Talha]

Re: O'level Maths, Addmaths and Statistics help available he

smebdy reply to my post??.....