Qualification > Math
IGCSE MATHS Doubts
nid404:
please post the paper up
contraentry:
if You are talkin' bout paper 4:
2(a)(iv): Look at triangle 'X', its points have moved from triangle U, parallel to the Y -axis, yet its area remains the same as triangle U. Hence, it is a shear.
Now look at each individual point that has moved, (from U onto X) and hence determine the Shear factor, using the formula Shear factor = Distance a point has moved due to a shear (divided by) its distance from the invariant line. In a shear, the invariant line and parallel line are the same, hence, using the formula you get shear factor as 1.
Therefore the transformation can be described as: A shear with the Y axis invariant line and shear factor 1.
2b(ii) : This will be then inverse of the matrix of the shear in part 2(a)(iv). [Check this in the formula booklet]
10(f):substitute (n-1) in the previous equation's "n" place, and simplfy
10(g): Unfortunately, I do not understand this subsection of the question either, sorry, I cannot help you out with this.
I understood it now!
10(g): total of the numbers in row "n" = n(n2-n+1) + (total of n-1 even numbers)
From part (f): we know the total of n-1 even numbers is (n-1)n =n2-n
so now simplify and you should arrive at the answer in c(ii) = n3
Ghost Of Highbury:
10g) ok u actually have to use all the three answers.
lets start by the sequence to find the total of the numbers. one of the example which were given is
(4 × 13) + 2 + 4 + 6
now the first number (4) is the row number.
the second digit (13) is the first number of that row
the last sequence (2+4+6) is the total of the first (n-1) even numbers, in this case the first (4-1) = 3 even numbers
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The row number is 'n'
the first number of the row is determined by the formula as shown in (d) part.
The last sequence is determined by as obtained in the (f) part.
-
u just have to put them all together as this pattern "(4 × 13) + 2 + 4 + 6" to prove that it is equal to ((c)ii)
--
heres how u do it
simplify to get
= = the answer obtained in c)ii) part.
Hence Proved.
PeaceMaker:
Well, it would be nice if someone would answer and is sure so that not much more time is wasted since the exams are soon.
Ghost Of Highbury:
--- Quote from: PeaceMaker on May 06, 2010, 03:55:58 pm ---Does anybody know what Paper 2 focuses on and what Paper 4 focuses on mostly? I dont want to waste my time studying chapters irrelevant to what they mostly focus/bring in paper 2/4.
--- End quote ---
There are no irrelevant chapters in maths. expect questions from every chapter in both the papers.
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