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Maths, Addmaths and Statistics: Post your doubts here!

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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

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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
 
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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 .
 
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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. =(
 
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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. :)
 

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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. :)
 

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

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

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

Can we use synthetic division method to solve cubic equations?
 
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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
 
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Re: O'level Maths, Addmaths and Statistics help available he

xhizors said:
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!!
 
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